Article ID: 2702963 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the Exchange server cannot retrieve a property of the conflict notification message.
To resolve this issue, install the following update rollup:
(https://support.microsoft.com/kb/2706690/ )Description of Update Rollup 4 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about a similar issue that occurs in Exchange Server 2007, click the following article number to view the article in the Microsoft Knowledge Base:
953312For more information about the conflict notification message, go to the following Microsoft website:
(https://support.microsoft.com/kb/953312/ )The "Open Message In Conflict" button is not available in the conflict notification message for Exchange Server 2007 users
General information about conflict notification messages
Article ID: 2702963 - Last Review: August 14, 2012 - Revision: 1.0