Microsoft small business knowledge base

Article ID: 2528854 - Last Review: October 28, 2011 - Revision: 1.0


The Microsoft Exchange Mailbox Replication service crashes on a computer that has Microsoft Exchange Server 2010 Service Pack 1 (SP1) installed. Additionally, the following event is logged in the Application log: 

Log Name: Application
Source: MSExchange Common
Event ID: 4999
Task Category: General
Level: Error
Keywords: Classic
Watson report about to be sent for process id: ID , with parameters: paramter , MSExchangeMailboxReplication, M.Exchange.PST, M.E.P.PSTFolder..ctor, System.NullReferenceException, c16e, version number.


This issue occurs because the value of certain variable is set to Null. However, the Microsoft Exchange Mailbox Replication service does not check for null value before it accesses the variable.


To resolve this issue, install the following update rollup:
2608646  ( ) Description of Update Rollup 6 for Exchange Server 2010 Service Pack 1


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

  • Microsoft Exchange Server 2010 Service Pack 1
  • Microsoft Exchange Server 2010 Enterprise
  • Microsoft Exchange Server 2010 Standard
kbfix kbexpertiseadvanced kbexpertiseinter kbsurveynew kbqfe KB2528854
Additional support options
Ask The Microsoft Small Business Support Community
Contact Microsoft Small Business Support
Find Microsoft Small Business Support Certified Partner
Find a Microsoft Store For In-Person Small Business Support