Exchange Connection

I am transitioning a single server network from old to new... New server is running on a new local domain with completely rebuilt AD structure but with same usernames etc.

Old was...
Server 2003 Std SP1
Exchange 2003 Std

New is...
Server 2008 R2 Std
Exchange 2010 Std SP2

All is up and running on the new server but DHCP service is still being supplied by OLD server until email accounts have been transitioned. Have been trying to connect a client running Outlook 2003 but the connection insists on finding the old server on the OLD domain after removing the Exchange connection, restarting and attempting to join the NEW. Yes - entered the FQDN for the NEW server and the NEW server is reachable from the client. The connection seemed OK (underlined the server and user) when the new connection was made but upon restarting Outlook, the OLD Exch server was contacted and new OST was rebuilt.

Any suggestions or experience with this?
(posted this quickly - hope it is clear enough)
LVL 2
DanielTAsked:
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isaman07Commented:
Too many missing info
Are they both in the same domain?
If not both in same domain is the client station joined the new domain?
Are these SBS servers?
Are there any scripts or profiles applied on users?
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DanielTAuthor Commented:
Thanks for posting. Actually, some of the questions are answered - they are different local domains and they are not SBS (note STD). However, I did not mention that the client is actually joined to the new domain succesfully and there are no logon scripts or profiles applied. Does that help?

I may just have to go through the process again as everything seemed as if it should be OK.
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isaman07Commented:
Is this happening on all clients or only one? All users or only specific users?
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DanielTAuthor Commented:
Thanks to you who posted. The issue has been resolved.

The email client profile was the issue.
Once it was deleted and recreated from scratch everything was just fine.
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DanielTAuthor Commented:
No other posts assisted in resolving.
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