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IMAP4 clients cannot log on to Exchange Server 2003 servers when the Exchange Server 2010 Client Access server is used to handle proxy requests
Article ID: 2616230 - View products that this article applies to.
Consider the following scenario:
The server has rejected your login. Please verify that your user name and password are correct.
This issue occurs because the Exchange Server 2010 Client Access server incorrectly handles the namespace string that is returned from the Chinese version of Exchange Server 2003. The returned namespace string does not have the required quotation marks. Therefore, the logon process fails when the Exchange Server 2010 Client Access server checks the text pattern.
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/2645995/ )Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2616230 - Last Review: February 21, 2012 - Revision: 2.0