Exhibit 99.1
CERTIFICATION PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
(18 U.S.C. SECTION 1350)
In
connection with the Quarterly Report of Microsoft Corporation, a Washington corporation (the “Company”), on Form 10-Q for the quarter ending December 31, 2002 as filed with the Securities and Exchange Commission (the “Report”),
I, Steven A. Ballmer, Chief Executive Officer of the Company, certify, pursuant to § 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. § 1350), that to my knowledge:
(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 result of operations of
the Company.
/s/ STEVEN A. BALLMER
Steven A. Ballmer
Chief Executive Officer
January 31, 2003