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Outlook Popup Window after Exchange migration

We have recently migrated our clients from an in-house Exchange server to a 'cloud' type solution (basically a remote Exchange server somewhere).  We have not done anything to uninstall the old Exchange server, the only thing that we did was turn off the old Exchange services.  Now we are getting a popup with the title bar saying 'Connect to <domain>' and it says 'Welcome back to <domain>', with a username and password prompt.  This occurs quite frequently throughout the day, if the client cancels out of it a few time they can get into their email.
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takenoco
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How are you connecting to the remote exchange server? via https?  are you using their AD to authenticate?  

What is the version of outlook and exchange?
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We are connecting to the new Exchange server through https.  The Outlook client version is 2007, and the Exchange server and structure behind it are unknown due to the service being supplied by a different vendor, there is no way that they are using our AD to authenticate though.
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Check if they have an ldap address book configured on the outlooks (connected to the old Exchange).

 Try also to reconfigure a new outlook profile.
i am thinking the connection between Outlook and exchange server got disconnect from time to time.  Do you notice if the outlook complain it can't connect to exchange server before the username/password window pop up?
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Needed to uninstall old Exchange 2003, must have had some old DNS entries