Migrating On-Premise Exchange mailboxes to Exchange Online with an Exchange-based hybrid deployment, you can choose to either move on-premises Exchange mailboxes to the Exchange Online organization or move Exchange Online mailboxes to the Exchange organization. When you move mailboxes between the on-premises and Exchange Online organizations, you use migration batches to perform the remote mailbox move request.
By following the procedures below, we assume that you have already configured the Exchange Hybrid Setup from your on-premise Exchange server to the O365 Exchange Online.
Procedure:
1. Login to https://outlook.office365.com/ecp/ using the O365 Global Admin Account
2. In the Dashboard, click on Migration
3. In the Migration Page, click on the “ + “ sign and from the drop-down menu select “Migrate to Exchange Online “.
4. On the next screen, select “Remote Move” as a migration type and click Next.
5. On the next page, select the users that you need to migrate by clicking on the “+” sign under “Select the users that you want to move” section.
Note: you can also create a CSV file containing all the UPN of the users for migration
You can select multiple users in one batch and click Next.
6. Since we already configured the Hybrid Setup, you can directly click on Next.
7. On the next window, configure the following:
➢ New migration batch name:
o Select the desired batch name
➢ Target delivery domain:
o This is the default O365 tenant domain with onmicrosoft.com
➢ Archive:
o Select to move the primary mailbox
➢ Bad Item Limit:
o When this limit is being hit, the migration of the mailbox will stop.
➢ Large Item Limit:
8. On Start, the Batch Window, configure the following and click on New:
➢ Select who will receive the migration batch report
➢ Select to start the batch manually. This will give you additional time to review the migration batch before starting.
➢ Select to complete the batch manually. This will give you additional time to review all the migration status before completing the migration batch.
9. After clicking the NEW button, you will be redirected back to the Migration Page. From there,
you can see the status of the created migration batch as stopped. On the Direction status, you
will see that there is an Onboarding process happening.
Click on ▶️ icon to start the migration batch.
Click on View Details to view the User status
10. After all the mailboxes have been synchronized, you can see the status as synced.
Click on View Details to see the details of the synced mailboxes. You will see how many items have been migrated and how many were skipped.
11. Once you have verified all the mailbox items, you can proceed on clicking the Complete this migration batch
Click on YES.
Once completed, the migration status will be changed to Completed from Synced
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