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Exhange Server 2013 Migration

We currently have a single forest with multiple domains. Each domain is currently running Microsoft Exchange Server 2010 setup with two mailbox servers and two CAS/HUB transport servers. One of our sites is planning on migrating to Microsoft Exchange Server 2013; however, not all of our other sites have the latest service pack and cumulative update. Are there any issues with updating the AD Schema when a Exchange 2010 server is not at the latest service pack and CU? Should I have the other site install the latest SP and CU before updating the schema?
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illfusion82
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illfusion82
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Todd NelsonSystems EngineerCommented:
Because you should need to prepare the Active Directory schema for Exchange 2013 from the schema master it will be important to make sure that all of the Exchange 2010 servers meet the minimum coexistence requirements ... Exchange 2010 SP3 (no update rollup).  If it were me, I would install the latest update rollup (SP3 UR14) to maintain supportability with Microsoft.  Microsoft only supports the latest 2 updates for any version of Exchange.  Presently, for Exchange 2010 SP3, only UR13 and UR14 are supported; and for Exchange 2013, only CU12 and CU13 are supported.

When you prepare AD, I recommend using the latest version of Exchange 2013 ... CU13.

https://technet.microsoft.com/en-us/library/Hh135098(v=EXCHG.150).aspx

If the Exchange 2010 environment has not been updated with SP3 at a minimum--because (in part) it updates the schema and domain(s) in preparation for Exchange 2013 coexistence--when you run the setup, you should see an error stating something to the effect that the environment isn't prepared for Exchange 2013.

Hope this helps.

References...
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