This is fact..MS knows that people wanted to get out of Xp, yet were scared to make the jump to Vista. Therefore, we all new the jump from XP people would be almost double that than from Vista users. And to further show this is fact, most XP users have wiped out there XP machines for a product that has clearly been marked "BETA" The downloads and feedback are almost 2 to 1 as XP users are utilizing this and harnessing this jump more. MS has no plans to makes things more difficult and hurt 7's launch, that is why a release candidate is planned in the month of august or prior to bridge the gap so to speak. But, we all know how things change..... Being part of MSDN I cant tell you how much changes from day to day.. Therefore, even though R1 is stated to be out to bridge the gap, its always best to be prepared for the worst and utilize a separate partition for a beta release.