Article ID: 954270 - Last Review: November 20, 2008 - Revision: 1.1 Message class changes during conversion when a digitally signed Message Disposition Notification is received by a server that is running Exchange Server 2007 Service Pack 1SYMPTOMSWhen a digitally signed Message Disposition Notification
(MDN) is received by a server that is running Microsoft Exchange Server 2007 Service Pack 1 (SP1), the message class changes during the conversion. Therefore,
the S/MIME signature may be invisible to clients. RESOLUTIONDownload and install Update Rollup 5 for Exchange Server 2007
Service Pack 1. For more information about Update Rollup 5 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: Description of Update Rollup 5 for Exchange Server 2007 Service Pack 1
(http://go.microsoft.com/fwlink/?LinkId=152553)
For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
(http://go.microsoft.com/fwlink/?LinkId=152570)
MORE INFORMATIONFor more information about MDN and about S/MIME, visit the
following Request for Comments (RFC) Web site: http://www.ietf.org/rfc/rfc3335.txt
(http://www.ietf.org/rfc/rfc3335.txt)
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