Quote - Unlike most of Microsoft's previous releases, one thing you cannot call Vista is "premature', it is in fact an update they've been working on for nearly 5 years now and is based off there 2003 server code.

You may not be aware that xp64 is also based off the 2003 server code, so you get all the benefits of 64 bit and XP without a resource hog UI like aero or horrible DRM. Even the much hyped DX 10 games are all falling flat on their face with poor performance and lots of bugginess when run in Vista.