Manage migration batches in Office 365
You can use the Migration dashboard in the Office 365 Exchange admin center (EAC) to manage mailbox migration to Office 365 using a cutover or staged Exchange migration. You can also use the Migration dashboard to migrate the contents of users' mailboxes from an on-premises IMAP server to existing Office 365 mailboxes. The Migration dashboard displays statistics about the overall migration in addition to statistics about a specific migration batch. You can create, start, stop, pause, and edit migration batches.
The Migration dashboard
To access the Migration dashboard in the EAC, select Recipients > Migration. The following screenshot identifies the different areas of the Migration dashboard that you can use to get migration information and manage migration batches.
Overall migration statistics
Click Status for all batches to display the overall statistics about all migration batches that have been created. The following fields display cumulative information about all migration batches.
||The total number of mailboxes from all current migration batches.
||The number of mailboxes from all migration batches that were successfully migrated.
||The number of mailboxes from all migration batches that have been finalized. Finalization occurs only when you use remote move migrations to migrate mailboxes between your on-premises Exchange organization and Office 365 in an Exchange hybrid deployment. Mailboxes can be finalized after the initial synchronization is successfully completed. For more information about finalizations in remote move migrations, see Complete-MigrationBatch.
||The number of mailboxes from all migration batches for which migration failed.
Migration batches that are created are listed in the migration queue. The following columns display information about each migration batch.
||The name of the migration batch that was defined when it was created.
||The status of the migration batch. The following is a list of the different status states for migration batches, along with what you can do with migration batches in each of these states:
Stopped: The migration batch has been created, but it hasn't been started. In this state, you can start, edit, or delete it.
Syncing: The migration batch has been started, and mailboxes in the migration batch are being actively migrated. When a migration batch is in this state, you can stop it.
**Stopping:**Immediately after you run Stop-MigrationBatch cmdlet.
Stopped: The migration batch is stopped, and no more mailboxes from the batch are being migrated. When a migration batch is in this state, you can restart it.
**Starting:**Immediately after you run Start-MigrationBatch cmdlet.
**Completing:**Immediately after you run Complete-MigrationBatch cmdlet.
**Removing:**Immediately after you run Remove-MigrationBatch cmdlet.
Synced: The migration batch has completed, and no mailboxes are being actively migrated. A migration batch in this state may contain errors if mailboxes weren't migrated. For cutover Exchange migrations and IMAP migrations with this status, on-premises mailboxes and the corresponding Office 365 mailboxes are synchronized every 24 hours during incremental synchronization.
**Completed:**The migration batch is complete.
Synced with errors: The migration batch has completed, but some mailboxes failed migration. Mailboxes that were successfully migrated in migration batches with errors are still synchronized every 24 hours during incremental synchronization.
||Indicates the number of mailboxes in the migration batch.
||Indicates the number of mailboxes that were successfully migrated.
||The number of mailboxes in the migration batch that have been finalized. Finalization is performed only for migration batches for remote move migrations in an Exchange hybrid deployment. For more information about the finalization process, see Complete-MigrationBatch.
||The number of mailboxes in the migration batch for which the migration failed. You can display information about specific mailboxes that have migration errors. For more information, see Migration users status report.
Migration batches with a status of Synced that have no administrator-initiated activity (for example, no administrator has stopped and restarted a migration batch or edited a migration batch) for the last 90 days will be stopped and then deleted 30 days later if no further action is taken by the administrator.
The Migration dashboard contains a set of commands that you can use to manage migration batches. After you create a migration batch, you can select it, and then click one of the following commands. If a migration batch is in a status state that isn't supported by a command, the command is either dimmed or not displayed because it's unavailable.
||Create a new migration batch. Use this command to migrate on-premises mailboxes to Office 365 (also called onboarding) or to migrate Office 365 mailboxes back to your on-premises Exchange organization in a hybrid deployment.
||Edit an existing migration batch. For staged Exchange migrations and IMAP migrations, you can submit a different CSV file. You can also change the migration endpoint used for the migration batch. You can edit only a migration batch that has a status of Created.
||Start a migration batch that's been created. After the batch is started, the status is changed to Syncing.
||Resume the running of a migration batch that was paused and has a status of Stopped. If there are errors for a migration batch, you can restart it with this command, and Office 365 will attempt to migrate the mailboxes that failed.
||Stop a migration batch that's currently running or that's been started but has a status of Queued. You can also stop a cutover Exchange migration batch or an IMAP migration batch that's completed the initiation synchronization phase and has a status of Synced. This will stop incremental synchronizations. You can resume incremental synchronizations by selecting the migration batch and clicking Resume.
||Delete a migration batch after you verify that all mailboxes in the migration batch have been successfully migrated. Verify also that mail is being routed directly to cloud-based mailboxes after you've configured your MX record to point to Office 365. When you delete a migration batch, Office 365 cleans up any records related to the migration batch and removes it from the list.
||Click this command, and then click Migration endpoints to create new migration endpoints or view and edit existing migration endpoints.
||Refresh the Migration dashboard to update the information displayed for the overall migration statistics, the list of migration batches, and the statistics for the selected migration batch.
Migration batch statistics
The details pane in the Migration dashboard displays the following information about the selected migration batch.
||Indicates the migration type of the selected migration batch. The value of this field also denotes the type of migration endpoint associated with the migration batch.
Exchange Outlook Anywhere: The migration batch is either a cutover Exchange migration or a staged Exchange migration.
IMAP: The migration batch is an IMAP migration.
Remote move migration: The migration batch is either an onboarding or offboarding remote move migration in an Exchange hybrid deployment.
||Indicates if mailboxes are being migrated to Office 365 or to your on-premises Exchange organization.
Onboarding Indicates that mailboxes are being migrated to Office 365. Onboarding migration types are staged migrations, cutover migrations, IMAP migrations, and onboarding remote move migrations.
Offboarding Indicates that Office 365 mailboxes are being migrated to your on-premises Exchange organization. Offboarding remote move migrations are the only type of offboarding migration.
||The current state of the selected migration batch.
Synced with errors
See the previous description of each of these states.
||The number of mailboxes to be migrated in the migration batch. This number corresponds to the number of rows in the migration CSV file for IMAP, staged, or remote move migrations, or the number of on-premises mailboxes in a cutover Exchange migration.
||The number of mailboxes out of the total number in the migration batch that have successfully completed initial synchronization. This field is updated during the migration.
||The number of mailboxes out of the total number in the migration batch that have successfully been finalized. Finalization only occurs in onboarding and offboarding remote move migrations.
||The number of mailboxes that failed initial synchronization.
||Click View details to display status information for each mailbox in the migration batch. For more information, see Migration users status report.
||The email address of the Office 365 administrator who created the migration batch.
||The date and time when the migration batch was created.
||The date and time when the migration batch was started.
|Initial sync time
||The date and time when the migration batch completed initial synchronization.
|Initial sync duration
||The amount of time it took to complete the initial synchronization for all mailboxes in the migration batch.
|Last sync time
||The last time the migration batch was restarted or the last time that incremental synchronization was performed for the batch. As previously stated, incremental synchronization occurs every 24 hours for IMAP migrations and cutover Exchange migrations.
||The name of the migration endpoint being used by the migration batch. You can click View details to view the migration endpoint settings. You can also edit the settings if none of the migration batches using the endpoint are currently running.