Nested .msg attachments are not detected as nested attachments in e-mail messages in Forefront Security for Exchange Server Service Pack 1

In Microsoft Forefront Security for Exchange Server Service Pack 1, nested attachments are counted. When the number of nested attachments exceeds the number that is set in the Max Nested Attachments setting in General Options, the whole attachment file is deleted.

However, some .msg attachments are not counted as nested attachments when the number of nested attachments is calculated. Therefore, these .msg attachments are not deleted, and they can pass through Forefront Security for Exchange Server Service Pack 1. This is true even if the nested attachment number exceeds the number in the Max Nested Attachments setting.

To resolve this problem, install the Forefront Security for Exchange Server Service Pack 1 Hotfix Rollup 3.

Note Forefront Security for Exchange Server Service Pack 1 must be installed before you install Hotfix Rollup 3 for Forefront Security for Exchange Server Service Pack 1.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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

To download Forefront Security for Exchange Server Service Pack 1, visit the following Microsoft Download Center Web site: For more information about Forefront Security for Exchange Server, visit the following Microsoft Web site: