Wamu Mortgage Pass Through Certs Series 2003-S5 Sample Contracts

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 29th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 30th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 27th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 29th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 27th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 30th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 2nd, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (June 4th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (May 4th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (April 5th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (March 3rd, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (February 4th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (January 7th, 2004)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (December 4th, 2003)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (November 4th, 2003)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (October 9th, 2003)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (September 9th, 2003)

The Group C-B Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Group I,and III Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated May 21, 2003 to that certain Prospectus Supplement, dated May 20, 2003, to which certain Group I,and III Certificates were offered. The Special Hazard, Bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the C-B certificates provide coverage to the Group I, and III Loans, subject to the conditions and limitations to payment specified thereunder.

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (August 8th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 07/2003 DISTRIBUTION REPORT SERIES: wamu 2003-s5 WEIGHTED AVERAGE PC RATE: 5.57073% POOL NUMBER: Group 1 = 2108, 2109, 2110 ____________________________________________________________________________________________ ISSUE DATE: 05/23/2003 CERTIFICATE BALANCE AT ISSUE: $850,272,703.17 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. (July 9th, 2003)

EXHIBIT 99 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. MASTER SERVICING MORTGAGE PASS-THROUGH CERTIFICATES 06/2003 DISTRIBUTION REPORT SERIES: wamu 2003-s5 WEIGHTED AVERAGE PC RATE: 5.57556% POOL NUMBER: Group 1 = 2108, 2109, 2110 ____________________________________________________________________________________________ ISSUE DATE: 05/23/2003 CERTIFICATE BALANCE AT ISSUE: $850,272,703.17 CERTIFICATE TOTAL ACCOUNT CERTIFICATE NUMBER OF ACTIVITY BALANCE MORTGAGES (@PC RATE) OUTSTANDING

Wamu Mortgage Pass Through Certs Series 2003-S5 – WASHINGTON MUTUAL MORTGAGE SECURITIES CORP., as Depositor and Master Servicer and as Trustee and CHRISTIANA BANK & TRUST COMPANY, as Delaware Trustee POOLING AND SERVICING AGREEMENT Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2003-S5 Cut-Off Date: May 1, 2003 (June 6th, 2003)

This Pooling and Servicing Agreement, dated and effective as of May 1, 2003 (this “Agreement”), is executed by and among Washington Mutual Mortgage Securities Corp., as depositor and Master Servicer (the “Company”), U.S. Bank National Association, a national banking association with a corporate trust office at One Federal Street, Third Floor, Boston, MA 02110, as Trustee (the “Trustee”), and Christiana Bank & Trust Company, as Delaware Trustee (the “Delaware Trustee”). Capitalized terms used in this Agreement and not otherwise defined have the meanings ascribed to such terms in Article I hereof.