"If you're just starting your testing of Vista, with the Windows 7 Release Candidate and the quality of that offering, I would switch over and do your testing on the Windows 7 RC, and use that going forward," said Bill Veghte, in a keynote speech. That same day, other Microsoft managers said work on Windows 7 should wrap up in August, which would indicate availability on new PCs and at retail stores as early as mid-October if the company uses the same pace as Windows XP eight years ago. "If they haven't started, certainly they should move right to Windows 7," said Silver today. "But the bigger question is what do those in the middle of planning do? Should they continue with Vista?"
More info: Computerworld