Article ID: 2724188 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the Exchange server incorrectly renormalizes the normalized subject line if the PR_SUBJECT_PREFIX property of the email message is set.
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 the PR_SUBJECT_PREFIX property, go to the following Microsoft website:
General information about the PR_SUBJECT_PREFIX property
Article ID: 2724188 - Last Review: August 14, 2012 - Revision: 2.0