Exhibit 23.1 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in this Amendment No. 1 to Registration Statement No. 333-40998 of Microsoft Corporation on Form S-3 of our report dated July 19, 1999, appearing in and incorporated by reference in the Annual Report on Form 10-K of Microsoft Corporation for the year ended June 30, 1999 and to the reference to us under the heading "Experts" in the Prospectus, which is part of such Registration Statement. Deloitte & Touche LLP Seattle, Washington July 31, 2000