Hi,
Now that Windows 8 and Windows Server 2012 are out, any company that uses KMS keys needs to add the new ones from Microsoft’s Volume Licensing Service Center
Once you request the hotfix, get the email and download it, and install. The install will require a reboot, so if you’ve got this on a critical server you’re going to have to schedule a reboot.
A few change request forms and approval signatures later, you’ll be finally ready to add your shiny new keys in.
Now, here’s the installation instructions from the link above:
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: Install this update (KB2691586). Restart the computer when you are prompted.
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
Note In this command, replace with 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_INSTALLEDFor example, you receive this error message if you try to install a KMS host key for Windows 7 on a computer that is running Windows Server 2008 R2.For more information about KMS host keys and about associated groups of Windows editions, see Table 5 in the “Determine Product Key Needs” section of the Volume Activation Planning Guide (http://technet.microsoft.com/en-us/library/dd878528.aspx#E3IAC) .
To activate the new KMS host key on the host computer, run the following command: cscript %windir%\system32\slmgr.vbs /ato
I had to read this more than once. Using the command cscript %windir%\system32\slmgr.vbs /ipk worked fine with the Server 2012 KMS key, but not with the Windows 8 key. You can’t mix both Windows 8 and Server 2012 keys on the same box, but it appears that as long as you enter the Server 2012 key, it also allows Windows 8 clients to register.
The secondcommand cscript %windir%\system32\slmgr.vbs /ato makes the server ‘phone home’ and completely register the keys.
Once you’ve got a client registered, you can use the command cscript %windir%\system32\slmgr.vbs /dli to show you when you registered, to which server etc.
Note: The Volume Activation Management Tool is useless for this, as it won’t recognise your new keys.
Good luck!