Microsoft, however, is also offering a 180-day free trial of Windows 8 for enterprise users via its Key Management Service (KMS). When you request the Windows 8 Media Center product key, Microsoft will send it and install a non-trial version of Windows 8 - even if you're still using the trial version of Windows 8 and haven't paid for the upgrade.
"Due to the fact that the WMC upgrade process does no checks for the validity of the activation, any activated copy of windows (even ones which were activated via KMS) are upgraded to a valid version of Windows 8 via the WMC upgrade. Uh oh!" Hall wrote.
Windows
Thank you for registering for our free Windows 8 Media Center Pack offer! **
Here’s your free Windows 8 Media Center Pack product key:
http://www.extremetech.com/computing/141052-microsoft-accidentally-gifts-pirates-with-a-free-windows-8-pro-license-key