Article ID: 2937628 - View products that this article applies to.
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Symptoms

Assume that a client application uses Microsoft Exchange Server MAPI Client and Collaboration Data Objects (MAPI/CDO) version 1.2.1 to connect to a Microsoft Exchange Server 2010, Exchange Server 2007 or Exchange Server 2003 server, and the version of Exchange MAPI/CDO update is 8.3.0.8309 or an earlier version. When a network event occurs, the client cannot connect to the server to sync email items.

Cause

This issue occurs because connection handle leaks occur on the client for each network event so that MAPI sessions are not actually closed and they keep connecting to the server. When the number of MAPI sessions reaches the limit of the server, new connections cannot be built. 

Resolution

To resolve this issue, download and then install Exchange MAPI/CDO 1.2.1 March 2014 Update from the following Microsoft website:

Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 March 2014 Update
Note The version of this update is 08.03.0.8353.000.

Status

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

More information

For more information about how to use MFCMAPI to create a MAPI profile to connect to Exchange 2010, go to the following Microsoft website:
How to use MFCMAPI to create a MAPI profile to connect to Exchange 2010
For more information about Exchange MAPI/CDO update (version: 8.3.0.8309), go to the following Microsoft website:
Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1

Properties

Article ID: 2937628 - Last Review: March 4, 2014 - Revision: 1.0
Applies to
  • Microsoft Exchange Server 2010 Enterprise
  • Microsoft Exchange Server 2010 Standard
  • Microsoft Exchange Server 2007 Standard Edition
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseadvanced KB2937628

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