If you have non-MAPI public folders in an Exchange Server organization, you cannot use Microsoft Forefront Security for Exchange to manually scan these public folders

If you have non-MAPI public folders in an Exchange Server organization, you cannot use Microsoft Forefront Security for Exchange to manually scan these public folders.

To resolve this problem, install Hotfix Rollup 3 for Microsoft Forefront Security for Exchange Server Service Pack 1 (SP1).

For more information, click the following article number to view the article in the Microsoft Knowledge Base: Note You must have Forefront Security for Exchange Server SP1 installed before you install this hotfix rollup.

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