EXHIBIT 99.1

CERTIFICATION OF CEO AND CFO PURSUANT TO

18 U.S.C. § 1350,

AS ADOPTED PURSUANT TO

§ 906 OF THE SARBANES-OXLEY ACT OF 2002

        In connection with the Quarterly Report on Form 10-Q/A of Xerox Corporation (the “Company”) for the quarterly period ending September 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Anne M. Mulcahy, Chairman of the Board and Chief Executive Officer of the Company, and Lawrence A. Zimmerman, Senior Vice President and Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of his/her knowledge, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/S/    ANNE M. MULCAHY                           

     Anne M. Mulcahy

     Chief Executive Officer

     March 27, 2003

/S/    LAWRENCE A. ZIMMERMAN            

     Lawrence A. Zimmerman

     Chief Financial Officer

     March 27, 2003

This certification accompanies this Report pursuant to § 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of § 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement required by § 906 has been provided to Xerox Corporation and will be retained by Xerox Corporation and furnished to the Securities and Exchange Commission or its staff upon request.