The only Exchange Server that is going to stay on-premises is the Exchange Server 2016. After the migration to Office 365 completes, the decommission of Exchange 2010 servers will start. The Exchange Server 2016 is going to be the Exchange Hybrid server. Looking at the organization, we can see that three Exchange Servers are running: Filling the credentials will not help you because it keeps asking for credentials. After waiting for minutes, a prompt shows up to enter credentials. After you finish completing the mailbox to Office 365, the user starts Outlook. The mailboxes/mailbox databases are currently on Exchange 2010. Outlook prompts for password after migration to Office 365 Add registry key AlwaysUseMSOAuthForAutoDiscover.Enable modern authentication in Microsoft 365 admin center.Solution for Outlook prompts for password after migration to Office 365.Outlook prompts for password after migration to Office 365.
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December 2022
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