The only time I've seen this is on an Information Store that is becoming corrupt. I "cleaned" the IS by installing Exchange on another server and moving the mailboxes and all other pertinent items (KB Article 152959).
Some of the mailboxes would not move via the Exchange Admin...
Use Microsoft's GP Inventory.
Free and downloadable from:
http://www.microsoft.com/downloads/details.aspx?FamilyID=1d24563d-cac9-4017-af14-8dd686a96540&displaylang=en
When using the "resolve name" in Outlook properties - this is actually using DNS. Check your DNS settings on your clients and verify that your new Exchange server IP is listed correctly on your DNS server.
I've had similar problems that have always pointed back to hard setting the NIC to full duplex AS WELL AS the port that the server is plugged into. If both are set to "AUTO" these connection problems come up sporadically.
Also verify that you're running the newest NIC drivers...
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