Start Express Migration in Microsoft M365

On a computer that is domain-joined to your on-premises organization, sign in to your Office 365 account by using your global admin credentials. Then start the Exchange Hybrid Configuration Wizard on the Data migration page of the Office 365 admin page.

1. In the Office 365 Admin center, go to Users > Data migration.
2. In the Migration page, click Exchange under Select your data service.
3. In the first Hybrid Configuration Wizard page, select next and in the On-premises Exchange Server Organization page, accept the default values and choose next.
   Note: By default, the wizard connects to the Exchange server running the latest version.
4. In the Credentials page, select Use current Windows credentials for on-premises Exchange server, and enter admin credentials for it and your Office 365 tenant.
5. Click next, and then choose next again once the connections and credentials are validated.
6. In the Hybrid Features page, select Minimal Hybrid Configuration > next.
7. In the Ready for Update page, choose update to prepare the on-premises mailboxes for migration.