How to Fix Exchange Public Folder Complete-MigrationBatch Errors
Question details
Administrators encounter errors when finalizing an Exchange 2016 to Exchange Online public folder migration.
- Product
- Microsoft Exchange Server
- Device & OS
- not provided
- Scenario
- Running the Complete-MigrationBatch command after a successful initial public folder synchronization.
- Observed behavior
- The synchronization succeeds, but the Complete-MigrationBatch command fails, reporting unsynchronized users or Active Directory control errors.
Ensure you have Exchange administrator permissions and that all preliminary preparation, synchronization, and unknown Security Identifier (SID) checks are completed successfully.
Review Migration Account and Folder Permissions
Check the public folder permissions and delegated users to identify the unsynchronized users causing the failure.
Often, the error stating that some users have not synchronized refers either to the migration account itself or to users who hold delegated public-folder permissions.
Ensure the administrator account running the migration has full administrative rights and is properly synced to Exchange Online.
Review the list of users with delegated public-folder access to identify any that have not synchronized with Azure Active Directory.
Determine if any remaining on-premises mailboxes are intentionally left behind or if they are causing synchronization holds for the public folders.
Troubleshoot Active Directory Connectivity
Resolve the 'server does not support the control' error by validating Active Directory connections and prerequisites.
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Frequently Asked Questions
What does 'some users are reported as unsynchronized' mean during Complete-MigrationBatch?
This error typically refers to the migration administrator account or specific users who have been granted delegated permissions to the public folders but have not successfully synced from your on-premises environment to Exchange Online.
Why do I get 'The server does not support the control' when restarting the migration?
This is an Active Directory error indicating a problem with the directory connection or missing prerequisites during the synchronization check between your on-premises Exchange server and Azure AD.
Do I need to migrate all mailboxes before finalizing public folders?
Not necessarily. You can leave some mailboxes on-premises, but you must ensure that your migration batch configuration correctly accounts for this hybrid state without expecting all user delegates to be moved to the cloud.
