KMS server for Windows 8.1 and Server 2012 R2

Update adds support for Windows 8.1 and Windows Server 2012 R2 clients to Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 KMS hosts.

http://support.microsoft.com/kb/2885698/da

If you have a KMS host that is running Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, or Windows Server 2012, follow these steps to perform an upgrade:

1. Install this update (update 2885698).
2. Restart the computer when you are prompted to do so.
3. To install a new KMS host key for Windows 8.1 activation or for Windows Server 2012 R2 activation, run the following command:

   cscript %windir%\system32\slmgr.vbs /ipk 

   Note In this command, “” is a placeholder for the new KMS host key for Windows 8.1 activation or for Windows Server 2012 R2 activation.