In cutover migration from Exchange Server 2007 to O365 how users will authenticated?


In cutover migration from Exchange Server 2007 to O365 how users will authenticated? What is the authentication mechanism? For example when users will change their AD password.

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Tom CieslikIT EngineerCommented:
You must setup Active directory synchronization with O365
You can either use synchronized identity or federated identity between your on-premises organization and Office 365

For your on-premises server on which you install Azure AD Connect to set up directory synchronization sign in to the Office 365 admin center and choose Users > Active Users on the left navigation.

In the Office 365 admin center, on the Active users page, choose ** More ** > Directory synchronization.
On the ** Is directory sync right for you? ** page, the two first choices of 1-10, and 11-50 result in "Based on the size of your organization, we recommend that you create and manage users in the cloud. Using directory synchronization will make your setup more complex. Go to Active users to add your users."

It's complicated to explain here but you can find a lot of Microsoft documentation how to do it and how mechanism is working.
For example please read this article

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