Outlook Pro Plus 365 Tries to Switch from On-Premises Exchange Server to Office 365

  • Thread starter Thread starter Michael1000
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Michael1000

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I have done a lot of research on this, and can't find a definitive answer.

We have an On-Premises Exchange Server. When we setup an Outlook Pro Plus 365 profile for our On-Premises Exchange Server, it connects to the server, but within a minute or two, Outlook puts up a dialog with the Heading "Microsoft Sign in". It is asking for an email or phone with a Next button to connect to Office 365. Outlook stops operating properly, and no emails go in or out. It appears that this problem starting occurring after we setup Microsoft Teams on the computers. Existing computers with Outlook already installed are still fine, but any new computer or new user added to a computer has this problem.

Bottom line, I need Outlook to stop trying to connect to Office 365.

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