When Microsoft Forefront Security for Exchange Server processes a message that contains invalid uuencode header information, Forefront Security for Exchange Server treats the message as a uuencode message. During the scanning process, Forefront Security for Exchange Server incorrectly detects the message as a CorruptedCompressedFile virus. Therefore, the message is blocked.

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To resolve this problem, install Hotfix Rollup 1 for Forefront Security for Exchange Server.

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

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

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