Today’s blog is regarding the expiration of the Windows 8.1 preview build which occurred yesterday January 15th, 2014.  If you installed the Windows 8.1 preview build and have not upgraded to 8.1 RTM you may notice that your machine is rebooting itself every 2 hours and you should also be getting the following notification when you login

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For more information on this and how to update to the final RTM build take a look at the following page: 

Update from Windows 8.1 Preview to Windows 8.1
http://windows.microsoft.com/en-us/windows-8/update-from-preview

Scott McArthur
Senior Support Escalation Engineer