Symptoms
Consider the following scenario:
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You connect to a Microsoft Exchange Server 2010 Client Access server by using an Internet Message Access Protocol (IMAP) client.
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You use the IMAP client to query information about a single part of an email message.
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The Content-Disposition field in the Simple Mail Transfer Protocol (SMTP) header of the email message contains no parameters.
In this scenario, you cannot read the email message by using the IMAP client.
For example, you query information about an email message that has the following SMTP header:
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Note The IMAP client cannot read the message because the Content-Disposition field contains no parameters.
However, an IMAP client can query information about an email message that has the following SMTP header:
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="test.txt"
Cause
This issue occurs because the Exchange Server 2010 IMAP service returns an RFC incompliant response against the FETCH (BODYSTRUCTURE) command when the Content-Disposition field contains no parameters.
Resolution
To resolve this issue, install the following update rollup:
2529939 Description of Update Rollup 3 for Exchange Server 2010 Service Pack 1
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
For more information about how to use IMAP, visit the following Microsoft website:
