MIME e-mail clients cannot read the body of clear signed messages in Outlook Web Access if the S/MIME control is not installed in Exchange Server 2007

MIME e-mail clients cannot read the body of clear signed messages in Outlook Web Access if the S/MIME control is not installed in Exchange Server 2007

Article ID : 951427
Last Review : May 28, 2008
Revision : 1.1

SYMPTOMS

According to RFC 2045, MIME e-mail clients that do not have S/MIME capability can read clear signed messages. However, for Microsoft Exchange Server 2007 users, MIME e-mail clients cannot read the body of clear signed messages in Microsoft Office Outlook Web Access if the S/MIME control is not installed. The body of the e-mail message is blank.

This problem affects both Microsoft Office Outlook Web Access Premium and Microsoft Office Outlook Web Access Light. Windows Internet Explorer 7 and later versions of Internet Explorer are the only versions of Internet Explorer that support the S/MIME control.

Note This problem occurs only if the following conditions are true:

• The e-mail messages are sent within a Microsoft Exchange Server organization.
• The e-mail messages are sent from Microsoft Exchange 2000 Server or from Microsoft Exchange Server 2003 to Exchange Server 2007.
• The e-mail messages are in an Exchange Server 2007 mailbox.

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WORKAROUND

To work around this problem, use Microsoft Outlook or another e-mail client that supports S/MIME.

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STATUS

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

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MORE INFORMATION

When messages are sent in Microsoft Transport Neutral Encapsulation Format (MS-TNEF) format from Exchange 2000 Server or from Exchange Server 2003 to Exchange Server 2007, certain properties are not converted. The Outlook Web Access client has to have these properties to display the body of the e-mail message.

If you forward the e-mail message in Outlook or if you perform any other operation that promotes the clear signed content to the relevant MAPI properties of the clear signed message, the body of the e-mail message is visible in Outlook Web Access.

For more information about clear signed messages, visit the following Web sites:

http://www.ietf.org/rfc/rfc2045.txt (http://www.ietf.org/rfc/rfc2045.txt)
http://technet.microsoft.com/en-us/library/aa995749(EXCHG.65).aspx (http://technet.microsoft.com/en-us/library/aa995749(EXCHG.65).aspx)

For more information about S/MIME, visit the following Web site:

http://technet.microsoft.com/en-us/library/aa995740.aspx (http://technet.microsoft.com/en-us/library/aa995740.aspx)

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APPLIES TO
• Microsoft Exchange Server 2007 Standard Edition
• Microsoft Exchange Server 2007 Enterprise Edition

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Keywords: 
kbprb kbtshoot kbexpertiseinter KB951427

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