Updated AD to 2012 R2 - EMC is slow to do anything

We recently updated our AD environment from 2003 to 2012 R2. Now the Exchange 2010 EMC is taking forever to do anything, doesn't return the right results, and often fails when doing AD queries.
If I launch ADUC on the same computer it works like a charm.
Does exchange 2010 cache a version of the AD topology? Is there a cache I can clear out or reset?

Hi,
In addition to Mike's suggestion, I would like to clarify the following thing:
Windows Server 2012 R2 Active Directory servers are supported by Exchange 2010 SP3 RU5 or later. Please make sure you have installed Exchange 2010 SP3 RU5 at least.
For your reference:
Exchange Server Supportability Matrix
http://technet.microsoft.com/library/ff728623(v=exchg.150).aspx
Hope it helps.
Best regards,
Amy Wang
TechNet Community Support

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