This update extends the Key Management Service (KMS) for Windows 7 and Windows Server 2008 R2 to allow enterprise licensing of Windows 8 and of Windows Server 2012.

KMS provides support for the following KMS client activations:

• Windows Server 2008 R2 and Windows Server 2008 R2 Service Pack 1 (SP1)
• Windows Server 2008 and Windows Server 2008 Service Pack 2 (SP2)
• Windows 8
• Windows Server 2012
• Windows 7 and Windows 7 Service Pack 1 (SP1)
• Windows Vista and Windows Vista Service Pack 2 (SP2)

Installation instructions

If you have a KMS host that is running Windows Server 2008 R2 SP1 or Windows 7 SP1, follow these steps to perform an upgrade:

1. Install this update (KB2691586).
2. Restart the computer when you are prompted.
3. 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 <KMS host key>
   Note In this command, replace <KMS host key> with the new KMS host key for Windows 8 activation or for Windows Server 2012 activation.
4. To activate the new KMS host key on the host computer, run the following command:
   cscript %windir%\system32\slmgr.vbs /ato