X0303 4 2009-02-18 0000789019 MICROSOFT CORP MSFT 0000902012 GATES WILLIAM H III ONE MICROSOFT WAY REDMOND WA 98052 1 0 0 0 Common Stock 2009-02-18 4 A 0 1655 0 A 753134134 D Represents stock award which is fully vested on the date of grant. In addition, there are 424,816 shares owned by the reporting person's spouse. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purposes. (a) Duly authorized under Special Limited Power of Attorney filed on February 17, 2009 as Exhibit 24.2 to Cascade Investment, L.L.C.'s Form 4 with respect to Republic Services, Inc. /s/ Alan Heuberger, Attorney-In-Fact for William H Gates III (a) 2009-02-20