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By default, additional logging is implemented in Microsoft Forefront Security for Exchange Server Service Pack 1 (SP1) Update Rollup 3. However, this new feature may cause queues to form in high mail flow environments in Exchange.
To resolve this issue, install Forefront Security for Exchange Server with Service Pack 2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
960465 Description of Forefront Security for Exchange Server with Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.