Exchange online

I have a local domain.  (abc.local)  This domain has an Exchange 2003 server running on a SBS 2003 Server. The workstations are running Outlook 2010 on their windows 7 PRO workstations.The exchange server accepts email for a public domain (user@pd.com). I want to migrate to Microsoft Exchange online. I added a second email account to the user's Outlook (user@pd.onmicrosoft.com).

When I did this everything works as expected, except I get a pop up asking for credentials for user@abc.local. I can either provide the password or just click cancel and both accounts work fine.

Why iis this login box poping up? How can I stop it from happening?
cwconleyPresidentAsked:
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AmitIT ArchitectCommented:
Is this a hybrid setup?
cwconleyPresidentAuthor Commented:
No,

I just have Outlook on the workstations setup with two exchange accounts. One for the on premises server and one for the Exchange online.
AmitIT ArchitectCommented:
I advise you first understand the concept of Exchange in Cloud. How it works? What kind of migration is good for your org and finally, how to migrate. Then only you can properly design your environment. Below the MS video series. Go through it, I am sure 99% issue will be resolved for you.

https://channel9.msdn.com/Series/Migrating-to-Exchange-Online/01

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FlippCommented:
From the description of what you have done I can't work out if you have migrated data or not. Generally if moving to Exchange Online you need to have your Users using your public domain on your SBS first.
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