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 (firstname.lastname@example.org). I want to migrate to Microsoft Exchange online. I added a second email account to the user's Outlook (email@example.com).
When I did this everything works as expected, except I get a pop up asking for credentials for firstname.lastname@example.org. 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?