X0101 42003-05-21 0000789019 MICROSOFT CORP MSFT 0000902015 BALLMER STEVEN A 1100Chief Executive OfficerCommon Stock2003-05-214S011410924.43D458764063DCommon Stock2003-05-214S02521024.44D458738853DCommon Stock2003-05-214S083345724.45D457905396DCommon Stock2003-05-214S024344124.46D457661955DCommon Stock2003-05-214S021246224.47D457449493DCommon Stock2003-05-214S06394224.48D457385551DCommon Stock2003-05-214S04186924.49D457343682DCommon Stock2003-05-214S020888624.5D457134796DCommon Stock2003-05-214S060024.51D457134196DCommon Stock2003-05-214S03520924.52D457098987DCommon Stock2003-05-214S0172524.53D457097262DCommon Stock2003-05-214S060024.55D457096662DCommon Stock2003-05-214S030024.56D457096362DCommon Stock2003-05-214S013100424.59D456965358DCommon Stock2003-05-214S06146624.6D456903892DCommon Stock2003-05-214S09294124.61D456810951DCommon Stock2003-05-214S012910924.62D456681842DCommon Stock2003-05-214S01158724.63D456670255DCommon Stock2003-05-214S0360024.65D456666655DCommon Stock2003-05-214S014348524.66D456523170DCommon Stock2003-05-214S025509624.67D456268074DThis sale was effected pursuant to a 10b5-1 sales plan adopted by the reporting person.This Form 4 is the third of three forms to report all May 21, 2003 transactions for the reporting person.John A. Seethoff, Attorney-in-Fact for Steven A. Ballmer2003-05-23