I was curious and went back to my records:The RC will expire June 1, 2010, and the bi-hourly shutdowns will begin on March 1, 2010. Thanks for the updates.This was the best OS roll out you have ever done.Keep up the great work and thank you for the time to test!Best Regards =)

Here is the KB article about the expiration date, for others who are interested: Description of Windows 7 Beta and Windows 7 Release Candidate (RC) expiration dates and functionality http://support.microsoft.com/kb/971767Sean Zhu - MSFT