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Migrating from Exchange On-Premise to Office 365 using cutover migration

You need to migrate mail from Exchange On-Premise to Office 365.

Note: you should not create any O365 users before running a cutover migration task.


  1. Log on to your O365 admin panel.
  2. Switch to the Exchange Admin panel
  3. Switch to recipients > migration, click the + and click ” Migrate to Exchange Online”
  4. Select “Cutover migration” and click Next.
  5. Enter the hostname for your Exchange server  and RPC proxy (usually the same machine). Click Next.
  6. Name the migration batch.
  7. Select a user or contact who should receive the results of the migration and click New.
  8. The migration will start immediately; depending on how many users and how much email each has, this could take several hours. Note that users will be created in O365 as mail is migrated in. If a user already exists in O365 for some reason, that migration task will fail and no mail will be imported

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