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If I have Windows Server 2012 R2 Standard User CALS. Can they be used if my backup DC is using Server 2008 R2 Datacenter? Or do iI need the Datacenter User CALs?

If I have Windows Server 2012 R2 Standard User CALS. Can they be used if my backup DC is using Server 2008 R2 Datacenter? Or do iI need the Datacenter User CALs?
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The Windows Server 2012 CALs may be used for prior Windows Server Versions.

Cite:

http://www.microsoft.com/OEM/en/licensing/productlicensing/Pages/server-cal.aspx
Sean GaughanIT administrator

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Commented:
Thanks, but unfortunately it still doesn't answer the specifics of my question on whether a Server 2010 R2 Standard licence covers use of a 2008 Datacenter server.
Windows Server User CALS don't differentiate between the edition of the server, just the version. There's not such a thing as a Datacenter CAL.

On the other hand, you've asked this question under Email_Servers but didn't mention Exchange CALS. Any users using exchange need at least a Server CAL and an Exchange Standard CAL for the most recent version of Server and Exchange that they connect to. There are also Exchange Enterprise CALs that you have to add on for each user that uses advanced Exchange services.

So, yes, with the limited certainty that anyone can have about Windows licensing,  the CALS you got to use with 2010 Server are good for use in an environment that includes a 2008 Server. The opposite would not be true.

Licensing the server is different. You can't use a Standard Server license to run a Datacenter Server.
Ooops. You were grading while I was editing. I hope the expanded answer is helpful.