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The RpcClientAccess process on an Exchange Server 2010 server crashes when you access a mailbox by using a MAPI application

You access a Microsoft Exchange Server 2010 mailbox by using a MAPI application, such as MFCMAPI. In this situation, the corresponding calls fail and the RpcClientAccess process on the Exchange server crashes when the Exchange Server 2010 mailbox is located on a recovery database. Additionally, you find the following error message in the Application event log:

Source: MSExchange Common
Event ID: 4999
Task Category: General
Level: Error
Watson report about to be sent for process id: <process ID>, with parameters: E12, <build type>, <application Version>, M.E.RpcClientAccess.Service, M.E.RpcClientAccess.Handler, M.E.R.H.RopHandler.FindLocalRecoveryDatabase, System.NullReferenceException, <callstackHash>, <assembly version>.

To resolve this problem, install the following update rollup:
982639 Description of Update Rollup 4 for Exchange Server 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about MFCMAPI, visit the following Microsoft website:

Article ID: 980852 - Last Review: 06/18/2010 04:01:00 - Revision: 2.0

  • Microsoft Exchange Server 2010 Enterprise
  • Microsoft Exchange Server 2010 Standard
  • kbqfe kbexpertiseinter kbsurveynew kbhotfixrollup kbfix KB980852