Windows KMS

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To install a new KMS host key for Windows 8 activation or for Windows Server 2012 activation, run the following command:

cscript %windir%\system32\slmgr.vbs /ipk 
Note In this command, "KMS host key" is a placeholder for the new KMS host key for Windows 8 activation or for Windows Server 2012 activation.

Important: Every KMS host key is associated with a group of Windows editions.