In the most recent post on Windows 7 team blog (April 7, 2009), Microsoft they forwarded a please as much as possible legitimate (but became fast controversy) to the testers Windows 7 Beta: that of not upgrading to RC from the Beta version, but to return to Vista before this upgrade or performing a "clean" installation its.

The RC is about getting breadth coverage to validate the product in real-world scenarios. As a result, we want to encourage you to revert to a Vista image and upgrade or to do a clean install, rather than upgrade the existing Beta. […] The reality is that upgrading from one pre-release build to another is not a scenario we want to focus on because it is not something real-world customers will experience. During development we introduce changes in the product (under the hood) that aren’t always compatible with what we call “build-to-build” upgrade. The supported upgrade scenario is from Windows Vista to Windows 7.

This prayer was made public shortly before ca Windows 7 Release Candidate to be launched by Microsoft, launch that could take place at the end of May this year, according to a post accidental made by technet.

Although those who want to upgrade to RC from Windows 7 Beta they will have this option, Microsoft requested the downgrade for a feedback cat mai real.

Microsoft certainly did not expect such a thing popularity of its new operating system since the Beta phase.

We’ve also learned that many of you (millions) are running Windows 7 Beta full time. You’re anxious for a refresh. You’ve installed all your applications. You’ve configured and customized the system. You would love to get the RC and quickly upgrade to it from Beta. […] We’re always humbled by the excitement around the releases and by the support and enthusiasm from those that choose to run our pre-releases. We’re incredibly appreciative of the time and effort you put into doing so. In return we hope we are providing you with a great release to work with at each stage of the evolution of the product. Our next stop is the RC…see you there!

That's right, neither do we :) But we are part of the group that uses Windows 7 as the main operating system. And when the case will be, we will downgrade to Vista.