Have you ever wonder why you cant start this service both automatically and manually?
Chances are if you are downloaded build 532.09 & have installed both CAS role and Mailbox role on the same box, you will have this issue.

The reason? unknown
Fix? Maybe next release of build.
However, there is a workaround, but requires modification of windows registry. So you with care
 "Mapi Rpc Endpoint Registration"=dword:00000002 

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