This update extends the Key Management Service (KMS) for Windows Vista, for Windows Server 2008, for Windows 7, and for Windows Server 2008 R2 to enable the enterprise licensing of Windows 8 and of Windows Server 2012.
KMS provides support for the following KMS client activations:
Windows Server 2008 R2
Windows Server 2008
Windows Server 2012
KMS uses a KMS host key to activate itself on a KMS host and to establish a local activation service in your environment. This update extends support for KMS to provide activation for Windows 8 and for Windows Server 2012.
How to obtain this update
The following files are available for download from the MicrosoftDownload Center:
All supported x86-based versions of Windows Vista and of Windows Server 2008
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
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If you have a KMS host that is running Windows Vista, Windows Server 2008, or Windows 7, or Windows Server 2008 R2, follow these steps to perform an upgrade:
Install this update (update 2757817).
Restart the computer when you are prompted to do this.
To install a new KMS host key for Windows 8 activation or for Windows Server 2012 activation, run the following command:
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. Additionally, a KMS host key that is associated with Windows client operating systems cannot be installed on Windows server operating systems, and vice-versa. This is true for all Windows operating systems except for Windows Server 2003. If you install a KMS host key on a Windows operating system that is not associated with that host key, you receive the following error message:
0xc004f015: The Software Licensing Service reported that the license is not installed. SL_E_PRODUCT_SKU_NOT_INSTALLED
For example, you may receive this error message in the following situations:
You try to install a Windows 7 KMS host key (CSVLK) on a Windows Server 2008 R2 KMS host.
You try to install a Windows 8 KMS host key (CSVLK) on a Windows Server 2008 R2 KMS host or a Windows Server 2012 KMS host.
To activate the new KMS host key on the host computer, run the following command:
cscript %windir%\system32\slmgr.vbs /ato
Note For information about which operating systems can be activated by a Windows 8 or Windows Server 2012 KMS host, see the "Plan for Key Management Services activation" section of the following Microsoft TechNet webpage: