How to Migrate Full Access and Send As Permissions to Microsoft 365
Question details
Understand the hybrid migration behavior for mailbox permissions when moving from on-premises Exchange to Microsoft 365.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Migrating shared or user mailboxes from an on-premises Exchange environment to Microsoft 365.
- Observed behavior
- Full Access permissions migrate with the mailbox, but Send As permissions do not synchronize and are missing post-migration.
Ensure you have Exchange Administrator credentials for Microsoft 365 and confirm that the mailbox migration has successfully completed before modifying permissions.
Manually Reassign Send As Permissions in Exchange Admin Center
Since Azure AD Connect does not synchronize Send As permissions, you must manually reapply them in Exchange Online after the migration.
During a hybrid migration, cross-premises Full Access permissions typically migrate seamlessly with the mailbox. However, Send As permissions require manual intervention because Azure AD Connect does not automatically sync them to Exchange Online.
Navigate to the Microsoft 365 Admin Portal and open the Exchange Admin Center using your administrator credentials.
Go to the 'Recipients' section and select 'Mailboxes'. Find and click on the specific mailbox that was recently migrated to Microsoft 365.
In the mailbox properties pane, select the 'Delegation' tab to view current permission settings.
Under 'Send As', click 'Edit' and add the users or groups that require Send As access. Save your changes.
Reapply Permissions Using Exchange Online PowerShell
For bulk migrations or environments with many shared mailboxes, using PowerShell is a faster way to reassign Send As permissions.
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Frequently Asked Questions
Why didn't my Send As permissions migrate to Microsoft 365 automatically?
In an Exchange hybrid environment, Azure AD Connect does not directly synchronize Send As permissions to the cloud. They must be manually reassigned in Exchange Online after the mailbox migration completes.
Do Full Access permissions migrate during a hybrid move?
Yes, unlike Send As permissions, cross-premises Full Access permissions typically migrate automatically along with the mailbox during an Exchange hybrid migration.
Can I reassign Send As permissions before the migration finishes?
No. You must wait until the mailbox has completely moved to Exchange Online before attempting to apply Send As permissions in the Microsoft 365 admin centers.
How long does it take for Send As permissions to take effect after reassignment?
After manually reassigning Send As permissions in Exchange Online, it can take up to 60 minutes for the changes to fully replicate and take effect for end users.
