Download it here: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=2db685c7-bb06-4083-9978-66b57661f6f7 Overview "Changes in Functionality from Windows Server 2008 to Windows Server 2008 R2" describes new and changed...
Go throught this video demos to get an understanding with KMS and Multiple Activcation Key on deploying Windows 7 and Windows Server 2008 R2 link [here] link [here]