troubleshooting Question

Some Outlook 2007 Clients ask to login after upgrade to new Exchange 2010 server.

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JScho10Flag for United States of America asked on
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I upgraded to a new Exchange 2010 server on a new machine.  Had an old Exhange 2007 server running which is DC.  Transfered all the mailboxes etc. to new Exch 2010.  Everything worked fine on new server until I uninstalled Exch 2007 on the old server.  Followed the technets for "Completely Removing Exchange 2007 from a Server".  Now some (not all) Outlook 2007 clients ask to login.  After login everything works. The old exhange 2007 continues to be the DC.  

Where should I start for fixing this?
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JScho10

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