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You cannot log on to your mailbox and you receive an error in an Exchange server 2003 and an Exchange Server 2007 coexist environment
Article ID: 975213 - View products that this article applies to.
Consider the following scenario:
"NO AUTHENTICATE failed"
When you use the PLAIN authentication mechanism, Exchange Server 2007 CAS passes the display name instead of the logon account name to the Exchange Server 2003 mailbox server. When this behavior occurs, authentication fails.
To fix this problem, apply the following update rollup:
(http://support.microsoft.com/kb/972076/ )Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the IMAP4 protocol and the PLAIN authentication mechanism, visit the following IETF Web sites:
Article ID: 975213 - Last Review: January 22, 2010 - Revision: 1.0