Secondary authentication for Outlook 2010

We are getting a pop up window asking for a user name and password when opening Outlook 2010. We have Exchange 2010 and just changed our email addresses to a new domain name.
Both the new and old email addresses work but it is annoying having to click on cancel on the pop up and click on need password on the lower right of the Outlook window.
Any help will be appreciated.
ECJIIIAsked:
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kdubendorfCommented:
Are you connected to Exchange using http?   Did you implement the new address on the same account as the old email address or are you trying to log into two separate Exchange accounts?   Almost sounds like your using http and have two accounts enabled.
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ECJIIIAuthor Commented:
Yes we are connected using http.
The new address is the primary SMTP address and the old address is a secondary address on the same account.
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kdubendorfCommented:
Shut Outlook down.   When you start it back up you will be asked for a password.

Put in Domain/Username for the User
Password for Password
Check the box to remember the password.


That should do it.  

Are you managing the Exchange server and are you local?   Is Exchange hosted somewhere else?  

If you're on the same network with Exchange you should be able to access it without http.  That way you won't ever be asked for the password if you're using your domain account for the Exchange Server.
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ECJIIIAuthor Commented:
Thanks for your help.

We finally resolved the issue.
It was actually a issue with our back up software Veeam failing on a replica job causing a brief server outage. We resolved the replica issue and it resolved the secondary authentication problem.
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ECJIIIAuthor Commented:
We thought this was an Exchange/Outlook issue but it really was caused by a replica job.
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