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The POP3 service crashes when a user connects to a mailbox that is migrated from an Exchange Server 2003 server to an Exchange Server 2010 server through the POP3 protocol
Article ID: 979431 - View products that this article applies to.
Consider the following scenario:
To fix this problem, apply the following update rollup:
(http://support.microsoft.com/kb/979611/ )Description of Update Rollup 2 for Exchange Server 2010: February 18, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.