Windows 8.1 Preview License Ends in January 2014
 

If you were trying out Windows 8.1 Preview before you either reverted back to your prior operating system or you are ready to install the commercial version on your computer, it's time to start making your plans for the transition. The Preview version of W8.1 is set to expire in January. Plans should be made to move to the released version of Windows 8.1 or return to the prior OS version as soon as possible to avoid interruption in use of the device on which the Windows 8.1 Preview was installed.

http://www.hardocp.com/news/2013/12/..._january_2014/