Microsoft reminds you all that as of today systems running the Beta release of its Windows 7 operating system - launched back in January this year - will begin to automatically shut down every two hours. This is a precaution used by Microsoft to remind testers that their beta copy of Windows 7 will expire on August 1st, so they need to switch to an alternative ligitimate operating system as soon as possible. Users may upgrade to the newer Windows 7 Release Candidate, but this will temporarily stop the bi-hour shut downs. Windows 7 RC will also eventually expire. RC users will face bi-hourly shutdowns beginning on March 1st 2010, and will be prompted to install the already officially released by that time version of Windows 7. Following that, the RC will expire on June 1st, 2010.