OAuth authentication for Exchange mailbox migrations to Microsoft 365

Microsoft 365 can now use OAuth when you move mailboxes between on-premises Exchange Server and Exchange Online. Previously, the Mailbox Replication Service (MRS) depended on the username and password of a privileged on-premises Active Directory account. This article walks through prerequisites, registering an app in Microsoft Entra ID, Exchange Server setting overrides, and creating an OAuth migration endpoint. It also discusses logging and known limitations. Source

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