When attempting to perform a mail merge in Microsoft Dynamics CRM 2011 on a large amount of records, such as a large group of Contacts in a Marketing List, Microsoft Office Word prematurely closes after clicking 'OK' in the Mail Merge Recipients window. 


Microsoft Office Word uses an internal queue to handle incoming mail merge items. However, when this queue becomes overloaded, it can cause Word to crash unexpectedly.


Increase the UserPostMessageLimit registry entry on the machine performing the mail merge.

Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986Description of the Microsoft Windows registry

  1. Open the Registry Editor

  2. Navigate to HKLM\Software\Microsoft\WindowsNT\CurrentVersion\Windows

  3. Double-click the USERPostMessageLimit registry entry and change the value from 10000 to 20000

  4. Close Regedit

  5. Restart the machine

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