KMS update with support for Windows Server 2012 R2 and Windows 8.1
Microsoft has released an update to existing KMS servers. (KB2885698) This update extends the Key Management Service (KMS) for Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 to enable the enterprise licensing of Windows 8.1 and Windows Server 2012 R2. KMS