The main steps you perform for a cutover migration are shown in the following illustration.

Process for performing a cutover email migration to Office 365

  1. The administrator communicates upcoming changes to users and verifies domain ownership with the domain registrar.
  2. The administrator prepares the servers for a cutover migration and creates empty mail-enabled security groups in Office 365.
  3. The administrator connects Office 365 to the on-premises email system (this is called creating a migration endpoint).
  4. The administrator migrates the mailboxes and then verifies the migration.
  5. Grant Office 365 licences to your users.
  6. The administrator configures the domain to begin routing email directly to Office 365.
  7. The administrator verifies that routing has changed, and then deletes the cutover migration batch.
  8. The administrator completes post-migration tasks in Office 365 (assigns licenses to users and creates an Autodiscover Domain Name System (DNS) record), and optionally decommissions the on-premises Exchange servers.
  9. The administrator sends a welcome letter to users to tell them about Office 365 and to describe how to sign in to their new mailboxes.

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