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KMS Update to Support Windows 8 / Windows Server 2012

KMS Update to Support Windows 8 / Windows Server 2012

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There is an update available that allows your KMS server to activate Windows 8 and Windows Server 2012 operating systems.

An update is available for Windows 7 and Windows Server 2008 R2 KMS hosts to support Windows 8 and Windows Server 2012


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  • I have attempted this upgrade and it doesn't work. I've confirmed with KMSADD@microsoft.com that the key I'm using is valid. I installed the hotfix and uninstalled the previous Host_B key, then installed the new key. I get "Error: 0xC004F050 The Software Licensing Service reported that the product key is invalid" I can reinstall the old version key with no problem. This is getting very frustrating and I'm begining to feel that the KMS system is more trouble than it's worth!

  • @Warren - Review this information <technet.microsoft.com/.../ee939271.aspx to make sure you are using the correct key.  If you are still stuck you should open a support case at 1-800-936-3100.  Trust me, if you have a large environment with thousands of computers and servers KMS is worth the effort.

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