The keys are available on Technet, but when I try to add the product key the keys so not even match... for example;Technet gives me: xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (5-5-5-5-5 characters)Exchange 2010 RTM: xxxx-xxxxx-xxxxx-xxxxx-xxxxx (4-5-5-5-5 characters) so the key is invalid as the first set should be only 4 characters.

Strange nvm, entered using the powershell and it worked, but the EMV only had 4 characters allowed in the first part...

Hi,From my lab, it has five chareacters. Please ensure that all the exchange servers are in the same version state.Besides, please try to apply rollup 1 for exchange 2010 and then check the issue again.Update Rollup 1 for Exchange Server 2010 (KB976573)http://www.microsoft.com/downloads/details.aspx?FamilyID=371add31-d7a0-4c8b-8325-a6fced2d05e6&displaylang=enRegards,Xiu