http://blogs.technet.com/b/drey/archive/2009/04/07/information-on-the-windows-7-upgrade-posted.aspxtoday we've posted addtional information in preparation for the release candidate for windows 7 on the engineering 7 blog. it confirms what a lot of people have been asking me – you will be able to upgrade from the beta or interim builds to the releaseen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)