In reality, Microsoft’s Q3 2010 profits from Windows were up 35% over its Q3 2009 figures only because Q3 2009 had plunged to $2,273 million, making this year’s Q3 income of $3,061 million seem like growth when in reality, it was still lower than Microsoft had reported in Q3 2008 (when the company earned $3.1 billion) and significantly down from 2007 (when it earned $4.2 billion).
Those figures don't lie. Microsoft earned around 15% less in it's first quarter after the Windows 7 launch than it did in the first Quarter after the Vista launch.