As suggested by Vincent it's best to verify with Microsoft if you can get a copy. The product key viewer does not work for most Windows 2008 installs as the key is encrypted within the registry, it will only bring back BBBBB-BBBBB-BBBBB-BBBBB characters. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet. Microsoft does not control these sites and has not tested any software or information found on these sites therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there.

Open the command prompt and change working directory to System32 directory Type in slmgr.vbs -ckms (this clears and KMS entry you may have) Type slmgr.vbs -upk (this removes any product key installed) Type slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (where. Microsoft is providing this information as a convenience Right click my computer->properties->change product key and volume licencing contacts. Important Note: This response contains a reference to a third party World Wide Web site. Or else, you can call Microsoft support to see whether you can get a copy. It is recommended that you contact your vendor. However, if you want to get a copy of the Windows Server 2008 R2, You can use some tool such as ProduKey to view the key on the server.

Windows server 2008 r2 license key