Consider the following scenario:
- You receive a signed message in a Microsoft Exchange Server 2010 Service Pack 2 (SP2) environment that has Update Rollup 1 or a later update rollup installed.
- The signed message contains an embedded message that has file attachments.
- You open the signed message, and then open the embedded message.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.