Schedule 13d

Filed by: SPO ADVISORY CORP
Subject Company: ADVENT SOFTWARE, INC.
Filed as of Date: 08/12/2008
View Original Filing on Edgar's
0000891836-08-000154.txt : 20080812
<SEC-HEADER>0000891836-08-000154.hdr.sgml : 20080812
<ACCEPTANCE-DATETIME>20080812165443
ACCESSION NUMBER:		0000891836-08-000154
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20080812
DATE AS OF CHANGE:		20080812
GROUP MEMBERS:		EDWARD H. MCDERMOTT
GROUP MEMBERS:		ELI J. WEINBERG
GROUP MEMBERS:		JOHN H. SCULLY
GROUP MEMBERS:		PHOEBE SNOW FOUNDATION, INC.
GROUP MEMBERS:		SAN FRANCISCO PARTNERS II, L.P.
GROUP MEMBERS:		SF ADVISORY PARTNERS, L.P.
GROUP MEMBERS:		SPO ADVISORY CORP.
GROUP MEMBERS:		SPO ADVISORY PARTNERS, L.P.
GROUP MEMBERS:		SPO PARTNERS II, L.P.
GROUP MEMBERS:		THE ELIZABETH R & WILLIAM J. PATTERSON FOUNDATION
GROUP MEMBERS:		WILLIAM E. OBERNDORF
GROUP MEMBERS:		WILLIAM J. PATTERSON

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ADVENT SOFTWARE INC /DE/
		CENTRAL INDEX KEY:			0001002225
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
		IRS NUMBER:				942901952
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-46001
		FILM NUMBER:		081010336

	BUSINESS ADDRESS:	
		STREET 1:		600 TOWNSEND ST
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94103
		BUSINESS PHONE:		4155437696

	MAIL ADDRESS:	
		STREET 1:		600 TOWNSEND ST
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94103

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SPO ADVISORY CORP
		CENTRAL INDEX KEY:			0000919468
		IRS NUMBER:				680247274
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		591 REDWOOD HIGHWAY
		STREET 2:		SUITE 3215
		CITY:			MILL VALLEY
		STATE:			CA
		ZIP:			94941
		BUSINESS PHONE:		4153836600

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SF ADVISORY CORP
		DATE OF NAME CHANGE:	19990329
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>sc0055-08.txt
<DESCRIPTION>AMENDMENT 16 TO SCHEDULE 13D
<TEXT>
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 16)*

                              Advent Software, Inc.

                                (Name of Issuer)

                          Common Stock, $.01 par value
                         (Title of Class of Securities)

                                    007974108
                                 (CUSIP Number)

                               SPO Partners & Co.
                         591 Redwood Highway, Suite 3215
                          Mill Valley, California 94941
                                 (415) 383-6600

                                 with a copy to:

                                Alison S. Ressler
                               Sullivan & Cromwell LLP
                             1888 Century Park East
                              Los Angeles, CA 90067
                                 (310) 712-6600
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                  August 11, 2008
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition is the subject of this Schedule 13D, and is filing this schedule
because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box [_].

Check the following box if a fee is being paid with the statement. [_]

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE 2 OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          SPO Partners II, L.P.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          WC
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          Delaware
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              7,211,400(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                7,211,400(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,211,400
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          26.9%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          PN
- --------------------------------------------------------------------------------

(1)  Power is exercised through its sole general partner, SPO Advisory Partners,
     L.P.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE 3 OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          SPO Advisory Partners, L.P.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          Delaware
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              7,211,400(1)(2)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                7,211,400(1)(2)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,211,400
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          26.9%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          PN
- --------------------------------------------------------------------------------

(1)  Solely in its capacity as the sole general partner of SPO Partners II, L.P.

(2)  Power is exercised through its sole general partner, SPO Advisory Corp.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE  4  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          San Francisco Partners II, L.P.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          WC
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          California
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              644,700(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                644,700(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          644,700
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          2.4%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          PN
- --------------------------------------------------------------------------------

(1)  Power is exercised through its sole general partner, SF Advisory Partners,
     L.P.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE  5  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          SF Advisory Partners, L.P.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          Delaware
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              644,700(1)(2)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                644,700(1)(2)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          644,700
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          2.4%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          PN
- --------------------------------------------------------------------------------

(1)  Solely in its capacity as the sole general partner of San Francisco
     Partners II, L.P.
(2)  Power is exercised through its sole general partner, SPO Advisory Corp.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE  6  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          SPO Advisory Corp.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          Delaware
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              7,856,100(1)(2)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                7,856,100(1)(2)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,856,100
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          29.3%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          CO
- --------------------------------------------------------------------------------

(1)  Solely in its capacity as the sole general partner of SPO Advisory
     Partners, L.P. with respect to 7,211,400 of such shares; and solely in its
     capacity as the sole general partner of SF Advisory Partners, L.P. with
     respect to 644,700 of such shares.
(2)  Power is exercised through its four controlling persons, John H. Scully,
     William E. Oberndorf, William J. Patterson and Edward H. McDermott.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE  7  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          John H. Scully
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          USA
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              84,100(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               7,856,100(2)
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                84,100(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         7,856,100(2)
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,940,200
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          29.6%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          IN
- --------------------------------------------------------------------------------

(1)  Of these shares, 200 shares are held in the John H. Scully Individual
     Retirement Accounts, which are self-directed, 53,500 shares underlie stock
     options granted to Mr. Scully as a member of the Board of Directors of the
     Issuer and 30,400 shares may be deemed to be beneficially owned by Mr.
     Scully solely in his capacity as controlling person, sole director and
     executive officer of Phoebe Snow Foundation, Inc.

(2)  These shares may be deemed to be beneficially owned by Mr. Scully solely in
     his capacity as one of four controlling persons of SPO Advisory Corp.

                                                                          <PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                         PAGE  8  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          William E. Oberndorf
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          USA
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              -0-
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               7,856,100(1)
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                -0-
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         7,856,100(1)
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,856,100
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          29.3%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          IN
- --------------------------------------------------------------------------------

(1)  These shares may be deemed to be beneficially owned by Mr. Oberndorf solely
     in his capacity as one of four controlling persons of SPO Advisory Corp.


<PAGE>


                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                        PAGE   9  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          William J. Patterson
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          USA
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              300(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               7,863,000(2)
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                300(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         7,863,000(2)
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,863,300
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          29.3%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          IN
- --------------------------------------------------------------------------------

(1)  These shares are held in the William J. Patterson Individual Retirement
     Account, which is self-directed.

(2)  Of these shares, 7,856,100 shares may be deemed to be beneficially owned by
     Mr. Patterson solely in his capacity as one of four controlling persons of
     SPO Advisory Corp. and 6,900 shares may be deemed to be beneficially owned
     by Mr. Patterson solely in his capacity as a controlling person, director
     and executive officer of The Elizabeth R. & William J. Patterson
     Foundation.


<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                        PAGE  10  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          Edward H. McDermott
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          Not Applicable
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          USA
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              -0-
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               7,856,100(2)
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                -0-
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         7,856,100(2)
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          7,856,100
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          29.3%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          IN
- --------------------------------------------------------------------------------

(1)  These shares may be deemed to be beneficially owned by Mr. McDermott solely
     in his capacity as one of four controlling persons of SPO Advisory Corp.

<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                        PAGE  11  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          Phoebe Snow Foundation, Inc.
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          WC
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          California
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              30,400(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                30,400(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          30,400
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          0.1%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          CO
- --------------------------------------------------------------------------------


(1)  Power is exercised through its controlling person, sole director and
     executive officer, John H. Scully.


<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                        PAGE  12  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          The Elizabeth R. & William J. Patterson Foundation
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          WC
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          California
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              6,900(1)
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                6,900(1)
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          6,900
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          **0.1%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          CO
- --------------------------------------------------------------------------------

**   denotes less than.

(1)  Power is exercised through its controlling persons, directors and executive
     officers, William J. Patterson and Elizabeth R. Patterson.



<PAGE>

                                  SCHEDULE 13D

- ---------------------                                      ---------------------
CUSIP No. 007974108                                        PAGE  13  OF 22 PAGES
- ---------------------                                      ---------------------
- --------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSON:
          Eli J. Weinberg
- --------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                  (a)  [ ]
                                                                        (b)  [X]
- --------------------------------------------------------------------------------
 3.  SEC USE ONLY

- --------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS:
          PF
- --------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEMS 2(e) OR 2(f):                                                     [ ]
- --------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION:
          USA
- --------------------------------------------------------------------------------
                 7.  SOLE VOTING POWER:
  NUMBER OF              170
    SHARES       ---------------------------------------------------------------
BENEFICIALLY     8.  SHARED VOTING POWER:
  OWNED BY               -0-
    EACH         ---------------------------------------------------------------
 REPORTING       9.  SOLE DISPOSITIVE POWER:
   PERSON                170
    WITH         ---------------------------------------------------------------
                 10. SHARED DISPOSITIVE POWER:
                         -0-
- --------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
          170
- --------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:  [ ]

- --------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
          **0.1%
- --------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON:
          IN
- --------------------------------------------------------------------------------

**   Denotes less than.


<PAGE>
                                                             PAGE 14 OF 22 PAGES

         This Amendment No. 16 amends the Schedule 13D (the "Original 13D")
filed with the Securities Exchange Commission ("SEC") on July 25, 2002, as
amended on August 6, 2002, September 9, 2002, September 19, 2002, September 26,
2002, October 15, 2002, March 13, 2003, March 17, 2003, March 25, 2003, May 12,
2003, November 5, 2003, December 4, 2003, August 14, 2007, August 23, 2007,
August 28, 2007 and September 10, 2007. Unless otherwise stated herein, the
Original 13D, as previously amended, remains in full force and effect. Terms
used herein and not defined herein shall have the meanings ascribed thereto in
the Original 13D, as amended. This Amendment No. 16 is being filed to add Edward
H. McDermott as a Reporting person, as a result of his becoming an additional
controlling person of SPO Advisory Corp.

ITEM 2. IDENTITY AND BACKGROUND.

         Item 2(a) is hereby amended and restated in its entirety as follows:

         (a) The undersigned hereby file this Schedule 13D Statement on behalf
of SPO Partners II, L.P., a Delaware limited partnership ("SPO"), SPO Advisory
Partners, L.P., a Delaware limited partnership ("SPO Advisory Partners"), San
Francisco Partners II, L.P., a California limited partnership ("SFP"), SF
Advisory Partners, L.P., a Delaware limited partnership ("SF Advisory
Partners"), SPO Advisory Corp., a Delaware corporation ("SPO Advisory Corp."),
John H. Scully ("JHS"), William E. Oberndorf ("WEO"), William J. Patterson
("WJP"), Edward H. McDermott ("EHM"), Phoebe Snow Foundation, Inc., a California
corporation ("PS Foundation"), The Elizabeth R. & William J. Patterson
Foundation, a California corporation ("Patterson Foundation") and Eli J.
Weinberg ("EJW"). SPO, SPO Advisory Partners, SFP, SF Advisory Partners, SPO
Advisory Corp., JHS, WEO, WJP, EHM, PS Foundation, Patterson Foundation and EJW
are sometimes hereinafter referred to as the "Reporting Persons." The Reporting
Persons are making this single, joint filing because they may be deemed to
constitute a "group" within the meaning of Section 13(d)(3) of the Securities
Exchange Act of 1934, as amended (the "Act"), although neither the fact of this
filing nor anything contained herein shall be deemed to be an admission by the
Reporting Persons that a group exists.

         The following subsection is hereby added to Item 2(b)-(c) in
appropriate alphabetical order as follows:

         EHM
         ---

         EHM's business address is 591 Redwood Highway, Suite 3215, Mill Valley,
California 94941. His present principal occupation is serving as a managing
director of SPO Partners & Co., a Delaware corporation. The principal business
of SPO Partners & Co. is operating as an investment firm. The principal business
address of SPO Partners & Co., which serves as its principal office, is 591
Redwood Highway, Suite 3215, Mill Valley, California 94941. EHM is one of four
controlling persons of SPO Advisory Corp., the sole general partner of each of
SPO Advisory Partners and SF Advisory Partners.

         The following subsections of Item 2(b)-(c) are hereby amended and
restated in their entirety as follows:

         JHS
         ---

         JHS's business address is 591 Redwood Highway, Suite 3215, Mill Valley,
California 94941. His present principal occupation is serving as a managing
director of SPO Partners & Co., a Delaware corporation. The principal business
of SPO Partners & Co. is operating as an investment firm. The principal business
address of SPO Partners & Co., which serves as its principal office, is 591
Redwood Highway, Suite 3215, Mill Valley, California 94941. JHS is one of four
controlling persons of SPO Advisory Corp., the sole general partner of each of
SPO Advisory Partners and SF Advisory Partners.

<PAGE>
                                                             PAGE 15 OF 22 PAGES

         WEO
         ---

         WEO's business address is 591 Redwood Highway, Suite 3215, Mill Valley,
California 94941. His present principal occupation is serving as a managing
director of SPO Partners & Co., a Delaware corporation. The principal business
of SPO Partners & Co. is operating as an investment firm. The principal business
address of SPO Partners & Co., which serves as its principal office, is 591
Redwood Highway, Suite 3215, Mill Valley, California 94941. WEO is one of four
controlling persons of SPO Advisory Corp., the sole general partner of each of
SPO Advisory Partners and SF Advisory Partners.

         WJP
         ---

         WJP's business address is 591 Redwood Highway, Suite 3215, Mill Valley,
California 94941. His present principal occupation is serving as a managing
director of SPO Partners & Co., a Delaware corporation. The principal business
of SPO Partners & Co. is operating as an investment firm. The principal business
address of SPO Partners & Co., which serves as its principal office, is 591
Redwood Highway, Suite 3215, Mill Valley, California 94941. WJP is one of four
controlling persons of SPO Advisory Corp., the sole general partner of each of
SPO Advisory Partners and SF Advisory Partners.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Item 3 is hereby amended and restated in its entirety as follows:

         The source and amount of the funds used or to be used by the Reporting
Persons to purchase Shares are as follows:

NAME                      SOURCE OF FUNDS                       AMOUNT OF FUNDS
- ---------------------     ----------------------------          ---------------
SPO                       Contributions from Partners            $146,535,348
SPO Advisory Partners     Not Applicable                         Not Applicable
SFP                       Contributions from Partners            $11,334,854
SF Advisory Partners      Not Applicable                         Not Applicable
SPO Advisory Corp.        Not Applicable                         Not Applicable
JHS                       Not Applicable and
                            Personal Funds                       $8,010
WEO                       Not Applicable                         Not Applicable
WJP                       Not Applicable and Personal Funds      $12,057
PS Foundation             Contributions from Shareholders        $1,204,585
Patterson Foundation      Contributions from Shareholders        $277,380
EJW                       Personal Funds                         $2,958


ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         Item 5 is hereby amended and restated in its entirety as follows:

(a) Percentage interest calculations for each Reporting Person are based upon
the Issuer having 26,818,384 total outstanding Shares as reported on the
Issuer's 10-Q filed with the Securities and Exchange Commission on May 8, 2008.

         SPO
         ---

         The aggregate number of Shares that SPO owns beneficially, pursuant to
Rule 13d-3 of the Act, is 7,211,400 Shares, which constitutes approximately
26.9% of the outstanding Shares.

<PAGE>

                                                             PAGE 16 OF 22 PAGES

         SPO Advisory Partners
         ---------------------

         Because of its position as the sole general partner of SPO, SPO
Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the
beneficial owner of 7,211,400 Shares, which constitutes approximately 26.9% of
the outstanding Shares.

         SFP
         ---

         The aggregate number of Shares that SFP owns beneficially, pursuant to
Rule 13d-3 of the Act, is 644,700 Shares, which constitutes approximately 2.4%
of the outstanding Shares.

         SF Advisory Partners
         --------------------

         Because of its position as the sole general partner of SFP, SF Advisory
Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial
owner of 644,700 Shares, which constitutes approximately 2.4% of the
outstanding Shares.

         SPO Advisory Corp.
         ------------------

         Because of its positions as the sole general partner of each of SPO
Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to
Rule 13d-3 of the Act, be deemed to be the beneficial owner of 7,856,100 Shares
in the aggregate, which constitutes approximately 29.3% of the outstanding
Shares.

         JHS
         ---

         Individually, and because of his positions as a control person of SPO
Advisory Corp. and control person, sole director and executive officer of PS
Foundation, JHS may, pursuant to Rule 13d-3 of the Act, be deemed to be the
beneficial owner of 7,940,200 Shares, which constitutes approximately 29.6% of
the outstanding Shares.

         WEO
         ---

         Because of his position as a control person of SPO Advisory Corp., WEO
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
7,856,100 Shares in the aggregate, which constitutes approximately 29.3% of
the outstanding Shares.

         WJP
         ---

         Individually, and because of his position as a control person of
SPO Advisory Corp. and as a control person, director and executive officer of
Patterson Foundation, WJP may, pursuant to Rule 13d-3 of the Act, be deemed to
be the beneficial owner of 7,863,300 Shares in the aggregate, which constitutes
approximately 29.3% of the outstanding Shares.

         EHM
         ---

         Because of his position as a control person of SPO Advisory Corp., EHM
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
7,856,100 Shares, which constitutes approximately 29.3% of the outstanding
Shares.

<PAGE>
                                                             PAGE 17 OF 22 PAGES
         PS FOUNDATION
         -------------

         The aggregate number of Shares that PS Foundation owns beneficially,
pursuant to Rule 13d-3 of the Act, is 30,400 Shares, which constitutes
approximately 0.1% of the outstanding Shares.

         PATTERSON FOUNDATION
         --------------------

         The aggregate number of Shares that Patterson Foundation owns
benefically, pursuant to Rule 13d-3 of the Act, is 6,900 Shares, which
constitutes less than 0.1% of the outstanding Shares.

         EJW
         ---

         The aggregate number of Shares that EJW owns beneficially, pursuant
to Rule 13d-3 of the Act, is 170 Shares, which constitutes less than 0.1%
of the outstanding Shares.

         To the best of the knowledge of each of the Reporting Persons, other
than as set forth above, none of the persons named in Item 2 hereof is the
beneficial owner of any Shares.

         (b)

         SPO
         ---

         Acting through its sole general partner, SPO has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 7,211,400
Shares.

         SPO Advisory Partners
         ---------------------

         Acting through its sole general partner and in its capacity as the sole
general partner of SPO, SPO Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 7,211,400 Shares
held by SPO.

         SFP
         ---

         Acting through its sole general partner, SFP has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 644,700
Shares.

         SF Advisory Partners
         --------------------

         Acting through its sole general partner and in its capacity as the sole
general partner of SFP, SF Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 644,700 Shares
held by SFP.

         SPO Advisory Corp.
         ------------------

         Acting through its controlling persons and in its capacities as the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
SPO Advisory Corp. has the sole power to vote or to direct the vote and to
dispose or to direct the disposition of 7,856,100 Shares held by SPO and SFP in
the aggregate.

<PAGE>

                                                             PAGE 18 OF 22 PAGES
         JHS
         ---

         As one of four controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
JHS may be deemed to have shared power with WEO, WJP and EHM to vote or to
direct the vote and to dispose or to direct the disposition of 7,856,100 Shares
held by SPO and SFP in the aggregate. In addition, JHS has the sole power to
vote or to direct the vote and to dispose or to direct the disposition of 200
Shares held in the John H. Scully Individual Retirement Accounts, which are
self-directed individual retirement accounts, 53,500 Shares underlying stock
options and 30,400 Shares held by the PS Foundation, for which JHS is the
controlling person, sole director and executive officer.

         WEO
         ---

         As one of four controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WEO may be deemed to have shared power with JHS, WJP and EHM to vote or to
direct the vote and to dispose or to direct the disposition of 7,856,100 Shares
held by SPO and SFP in the aggregate.

         WJP
         ---

         As one of four controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WJP may be deemed to have shared power with JHS, WEO and EHM to vote or to
direct the vote and to dispose or to direct the disposition of 7,856,100 Shares
held by SPO and SFP in the aggregate. WJP may be deemed to have shared power to
vote or to direct the vote and to dispose or to direct the disposition of 6,900
Shares held by the Patterson Foundation. In addition, WJP has the sole power to
vote or to direct the vote and to dispose or to direct the disposition of 300
Shares held in the William J. Patterson Individual Retirement Account, which is
a self-directed individual retirement account.

         EHM
         ---

         As one of four controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
EHM may be deemed to have shared power with JHS, WEO and WJP to vote or to
direct the vote and to dispose or to direct the disposition of 7,856,100 Shares
held by SPO and SFP in the aggregate.

         PS FOUNDATION
         -------------

         Acting through its controlling person, PS Foundation has the sole power
to vote or to direct the vote and to dispose or to direct the disposition of
30,400 Shares.

         PATTERSON FOUNDATION
         --------------------

         Acting through its two controlling persons, directors and executive
officers, Patterson Foundation has the sole power to vote or to direct the
vote and to dispose or to direct the disposition of 6,900 Shares.

<PAGE>
                                                             PAGE 19 OF 22 PAGES

         EJW
         ---

         EJW has the sole power to vote or to direct the vote and to dispose or
to direct the disposition of 170 Shares.

         (c) During the past 60 days, the Reporting Persons purchased Shares in
open market transactions on the Nasdaq Global Select Market as set forth on
Schedule I attached hereto.

         Except as set forth in this paragraph (c), to the best of the knowledge
of each of the Reporting Persons, none of the persons named in response to
paragraph (a) has effected any transactions in Shares.

         (d) Each of the Reporting Persons affirms that no person other than
such Reporting Person has the right to receive or the power to direct the
receipt of distributions with respect to, or the proceeds from the sale of, the
Shares owned by such Reporting Person.

         (e) Not applicable.


ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

         Item 7 is hereby amended and restated in its entirety as follows:

         Exhibit A - Agreement pursuant to Rule 13d-1(k)

         Exhibit B - Power of Attorney



<PAGE>

                                                             PAGE 20 OF 22 PAGES


                                   SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

         DATED:  August 12, 2008



                                      By:   /s/ Kim M. Silva
                                           ----------------------------------
                                           Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)
                                           EDWARD H. McDERMOTT (2)
                                           PHOEBE SNOW FOUNDATION, INC.(1)
                                           THE ELIZABETH R. & WILLIAM J.
                                             PATTERSON FOUNDATION(1)
                                           ELI J. WEINBERG(1)

                                           (1) A Power of Attorney authorizing
                                           Kim M. Silva to act on behalf of this
                                           person or entity has been previously
                                           filed with the Securities and
                                           Exchange Commission.

                                           (2) A Power of Attorney authorizing
                                           Kim M. Silva to act on behalf of this
                                           person or entity is filed as Exhibit
                                           B.

<PAGE>
<TABLE>
<CAPTION>
                                                                                        PAGE 21 OF 22 PAGES

                                         SCHEDULE I TO SCHEDULE 13D

                                    DATE OF                 NUMBER OF    PRICE PER     WHERE/HOW
REPORTING PERSON                    TRANSACTION     TYPE    SHARES       SHARE ($)     TRANSACTION EFFECTED
- ----------------                    -----------     ----    ---------    ---------     --------------------
<S>                                 <C>             <C>     <C>          <C>           <C>

None.

</TABLE>
<PAGE>


                                                             PAGE 21 OF 22 PAGES

                                  EXHIBIT INDEX

Exhibit     Document Description
- -------     --------------------
A           Agreement Pursuant to Rule 13d-1(k)

B           Power of Attorney
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.A
<SEQUENCE>2
<FILENAME>ex-a.txt
<TEXT>
                                                             PAGE 22 OF 22 PAGES

                                    EXHIBIT A

         Pursuant to Rule 13d-1(k) of Regulation 13D-G of the General Rules and
Regulations of the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended, the undersigned agrees that the statement to
which this Exhibit is attached is filed on behalf of each of them in the
capacities set forth below.


DATED:  August 12, 2008



                                      By:   /s/ Kim M. Silva
                                           ----------------------------------
                                           Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)
                                           EDWARD H. McDERMOTT(2)
                                           PHOEBE SNOW FOUNDATION, INC.(1)
                                           THE ELIZABETH R. & WILLIAM J.
                                             PATTERSON FOUNDATION(1)
                                           ELI J. WEINBERG(1)

                                           (1) A Power of Attorney authorizing
                                           Kim M. Silva to act on behalf of this
                                           person or entity has been previously
                                           filed with the Securities and
                                           Exchange Commission.

                                           (2) A Power of Attorney authorizing
                                           Kim M. Silva to act on behalf of this
                                           person or entity is filed as Exhibit
                                           B.

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.B
<SEQUENCE>3
<FILENAME>ex-b.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
                                    EXHIBIT B

                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that Edward H. McDermott (a
"Grantor") has made, constituted and appointed, and by these presents does make,
constitute and appoint, each of William E. Oberndorf and Kim M. Silva (each an
"Attorney"), the true and lawful agent and attorney-in-fact, with full power of
substitution and resubstitution, of the Grantor, for and in Grantor's name,
place and stead, in any and all capacities, to do all or any of the following
acts, matters and things:

     1.   To sign on behalf of the Grantor statements on Schedule 13D or 13G or
          Forms 3, 4 and 5, or amendments thereto pursuant to Section 13(d) or
          Section 16 under the Securities Exchange Act of 1934.

     2.   To do all such other acts and things as, in such Attorney's
          discretion, he or she deems appropriate or desirable for the purpose
          of filing such statements on Schedule 13D or 13G or Forms 3, 4 and 5,
          or amendments thereto.

     3.   To appoint in writing one or more substitutes who shall have the power
          to act on behalf of the Grantor as if that substitute or those
          substitutes shall have been originally appointed Attorney (s) by this
          Power of Attorney and/or to revoke any such appointment at any time
          without assigning any reason therefor.

         The Grantor hereby ratifies and confirms all that said agents and
attorneys-in-fact or any substitute or substitutes may lawfully do or cause to
be done by virtue hereof. This power of Attorney shall remain in full force and
effect until the undersigned is no longer required to file Forms 3, 4 and 5 or
to file reports under Section 13(d) of the Securities Exchange Act of 1934 with
respect to the undersigned's holdings of and transactions in securities issued
by Advent Software, Inc., unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.

         The words Grantor and Attorney shall include all grantors and attorneys
under this Power of Attorney.

         IN WITNESS WHEREOF, Grantor duly assents to this Power of Attorney by
his, her or its signature as of the 12th day of August, 2008.


                                            Edward H. McDermott

                                            /s/ Edward H. McDermott
                                            -------------------------

</TEXT>
</DOCUMENT>