Debugging Internal Emails with Exchange 2003/2010

Posted by user49995 on Server Fault See other posts from Server Fault or by user49995
Published on 2010-12-21T19:16:45Z Indexed on 2010/12/21 19:55 UTC
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I am in the middle of migrating from Exchange 2003 to Exchange 2010 SP1.

I have moved one mailbox over to the new server EXCHANGE2010 . For some reason if an internal email is sent from someone on EXCHANGE2003 (the old server), it is not delivered to the new mailbox on EXCHANGE2010.

Where should I look to debug this problem? What logs should I consult?

Update: I found the messages in Queues on the old server, listed as messages with an unreachable destination.

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