Error message when you use the IMAP protocol to send a SEARCH command that has the CHARSET argument on an Exchange 2007 server: "BAD Command Argument Error"

On a computer that is running Microsoft Exchange Server 2007 server, the IMAP SEARCH command does not support a CHARSET argument. If you use the IMAP protocol to send a SEARCH command that has the CHARSET argument, you may receive the following error message on the Exchange 2007 server:
However, based on RFC 3501, the response should be "NO" instead of "BAD" if the CHARSET argument cannot be recognized. Because of this problem, some IMAP based third-party applications do not work correctly with Exchange 2007 Server.

To resolve this problem, install Update Rollup 5 for Exchange 2007 Service Pack 1.
For more information about Update Rollup 5 for Exchange 2007 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:

For more information about RFC 3501, visit the following Web site:

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