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outlook 2010 is still pointing to the old exchange server after migrating mailbox

I am in the process of migrating mailboxes from one exchange 2010 server to another exchange 2010 server.  Mailbox boxes are moving fine, but I noticed one issue.  Once I moved my mailbox, I went to mail in the control panel and changed it to point to the new exchange server instead of the old one.  I type in the new exchange server name, click on check name and it reverts back to the old exchange 2010 server name.  I moved a couple other mailboxes and it did the same thing.  Mailflow is still working to these moved mailboxes, but I can't get outlook to use the new exchange server name.  I hope this make sense.  Any ideas or reasons why this is doing this would be greatly appreciated.  I am holding off moving the rest of the mailboxes until I figure out why it doing this.  I did blow away the outlook profile and make a new one and it still does the same thing.  Thanks.
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Adam BrownSenior Systems Admin
CERTIFIED EXPERT
Top Expert 2010

Commented:
That is Autoconfigure setting up the server name. It's kind of an automatic thing. Realistically, once you decommission the old Exchange server, Autoconfigure should start pointing your clients to the new server. It doesn't really matter which server it's using while both are up as long as they're both CAS servers.

Author

Commented:
Thanks.  So I shoudn't worry about it, and just continue migrating mailboxes?
Senior Systems Admin
CERTIFIED EXPERT
Top Expert 2010
Commented:
Yeah. Once you move the port forwarding to the new Exchange Server it will start giving you the name of the new server, since it will then be reading from the Autoconfig site on that server instead.

Author

Commented:
Thanks

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