RPCServ.exe*32 using constant 13% CPU Exchange 2010

Yesterday we had an issue where everyones Outlook was freezing and becoming non responsive. While looking at the server I noticed that the RPCServe.exe*32 was using a constant 13% cpu. I ran the performance monitor and noticed that the RPC Requests Outstanding was in the high 80% range. I ran the performance tool from exchange but all it told me is that MAPI and RPC was high by more than one user and it only listed one user. When we told him to log off of outlook the high RPC still remained. I tried stopping our BES server and our mailbox journaling but it didn't seem to help.

We eventually rebooted the server and all seems better. But what concerns me is that i dont know why and i still notice that the RPCServ.exe*32 is still running at 13% cpu, although no slowdowns in outlook.

I'm wondering if anyone else has seen this or has any way for me to determine what i can do if it happens again?
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msidnamAsked:
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AmitIT ArchitectCommented:
You can use process monitor to find the application causing the issue, before that you can also check this one.

http://www.experts-exchange.com/Software/Anti-Virus/Q_27275164.html
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msidnamAuthor Commented:
Excellent. thank you. I can't believe i missed that. I disabled our Groushield for the time being and RPCServ.exe*32 has disappeared.
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AmitIT ArchitectCommented:
Great you were able to find the root cause, now it is time to check few things.
http://technet.microsoft.com/en-us/library/bb332342(v=exchg.150).aspx
http://blogs.technet.com/b/davmcg/archive/2012/02/04/exchange-server-2010-and-antivirus-exclusions.aspx

Once you set the exclusion, start the service again and test, if it helps to resolve the issue.
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