An IMAP4 client cannot send an email message that has a large attachment in a mixed Exchange Server 2010 and Exchange Server 2003 environment

Article ID: 978292 - View products that this article applies to.
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SYMPTOMS

In a mixed Microsoft Exchange Server 2010 and Microsoft Exchange Server 2003 environment, an Exchange Server 2010 Client Access server handles the proxy requests for Exchange Server 2003 servers. A user accesses a mailbox which is hosted on an Exchange Server 2003 server by using an IMAP4 client. In this situation, the Exchange Server 2010 Client Access server advertises that the "Literal+" command is supported during the "capabilities" broadcast to the IMAP 4 client. However, the IMAP4 client may encounter certain issues. For example, the IMAP4 client cannot send an email message that has a large attachment.
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CAUSE

This problem occurs because Exchange Server 2003 has issues with the "Literal+" support.
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RESOLUTION

To resolve this problem, install the following update rollup:
2407028
(http://support.microsoft.com/kb/2407028/ )
Description of Update Rollup 1 for Exchange Server 2010 Service Pack 1
After you apply this update, you can set the DisableLiteralPlus key in the Microsoft.Exchange.Imap4.exe.config file to enable or disable the "Literal+" support feature. To do this, follow these steps:
  1. On the Exchange Server 2010 Client Access server, locate the following folder:

    <drive>:\Program Files\Microsoft\Exchange Server\ClientAccess\PopImap
  2. Make a backup copy of the Microsoft.Exchange.Imap4.exe.config file.
  3. Open the Microsoft.Exchange.Imap4.exe.config file in Notepad.
  4. In the line between <appSettings> and </appSettings>, insert the following code:
    <add key="DisableLiteralPlus" value="true" />
    Note If the value is True, the "Literal+" support feature is disabled. By default, the "Literal+" support feature is enabled.
  5. Save the changes, and then exit Notepad.
  6. Restart the Microsoft Exchange IMAP4 service. 
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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

For more information about the "Literal+" support of IMAP4, visit the following IETF website:
General information about the "Literal+" support of IMAP4
(http://tools.ietf.org/html/rfc2088)
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Properties

Article ID: 978292 - Last Review: December 29, 2010 - Revision: 4.0
APPLIES TO
  • Microsoft Exchange Server 2010 Service Pack 1
  • Microsoft Exchange Server 2010 Enterprise
  • Microsoft Exchange Server 2010 Standard
Keywords: 
kbexpertiseinter kbsurveynew kbhotfixrollup kbqfe kbfix KB978292
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