Maybe but according to this story, corporate customers are also being troublesome for them:
<< Redmond looked out and saw a corporate market essentially yawning at the prospect of buying Windows XP and Office XP upgrades, looked at their balance sheet, and decided to take matters into their own hands. Microsoft needs cash, but it also needs desktops upgraded--and soon. >>
M$'s new motto should be "Upgrade damnit!".