Microsoft has published hotfix for Key Management Service (KMS) for Windows 7 and Windows Server 2008 R2 to allow enterprise activation of Windows 8 and Windows Server 2012. This update is publish under article id 2691586 or http://support.microsoft.com/kb/2691586/en-us .
After installation of this hotfix, and rebooting when prompted you can install new KMS host key for Windows 8 or Windows Server 2012 using slmgr :
cscript slmgr.vbs /ipk <KMS Host key>and activate :
cscript slmgr.vbs /atoAfter successful activation of KMS host key, you can activate machines with installed Windows 8 or Windows Server 2012.
