Windows 7 Beta
Windows 7 Beta is a public beta of Windows 7. It was released to the public in early January and to MSDN and Technet subscribers a few days earlier. Microsoft originally said that they would allow 2.5 million people to download this beta, but due to high demand, unlimited downloads were available until February 10.
Expiration date
This version of Windows 7 will expire on 1 August 2009. After this date, users must uninstall the beta; otherwise, it will go into reduced functionality mode.