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Assistant stops processing new requests when Events in Queue value exceeds 500 in Exchange Server 2010

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Symptoms

When you use Microsoft Exchange Server 2010, Exchange assistants, such as Calendar Assistant, stop processing events. 

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Cause

This issue occurs when the number of events to process in the Events in Queue field is greater than 500. In this situation, a race condition occurs where the event dispatcher does not decrement the counter value when a mailbox is occupied in another thread.

Note The Events in Queue instance of the MSExchange Assistants - Per Assistant object in Performance Monitor counts the number of events to process.

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Resolution

To resolve this issue, install the following update:
2961522 Update Rollup 7 for Exchange Server 2010 Service Pack 3

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Workaround

To work around this issue, restart the Microsoft Exchange Mailbox Assistant service.

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Status

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

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Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseadvanced, kb

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Article Info
Article ID : 2976322
Revision : 1
Created on : 1/7/2017
Published on : 8/26/2014
Exists online : False
Views : 265