Does Email Delegation Work After Removing a Microsoft 365 License?
Question details
The user wants to know if mailbox delegation continues to function after removing a Microsoft 365 or Exchange Online license from an account.
- Product
- Microsoft 365 / Exchange Online
- Device & OS
- not provided
- Scenario
- An administrator or user is adjusting Microsoft 365 licenses and needs to preserve delegated access to a specific email account.
- Observed behavior
- Removing an Exchange Online license typically disables the user's individual mailbox, thereby interrupting normal email access and breaking existing delegation arrangements unless alternative configurations are applied.
Before removing any user license, ensure you have backed up necessary mailbox data and reviewed your organization's compliance requirements regarding data retention.
Convert to a Shared Mailbox to Maintain Delegation
To keep email delegation working without an active individual license, you must convert the user's mailbox to a Shared Mailbox before removing the license.
Removing a Microsoft 365 license immediately disables the individual mailbox. By converting it to a shared mailbox first, the mailbox data is preserved, and you can assign delegation permissions (Full Access, Send As, or Send on Behalf) to other licensed users without needing a dedicated license for the shared mailbox itself.
Sign in to the Microsoft 365 admin center using your administrator credentials, navigate to the left sidebar, and click on 'Exchange' under the Admin centers section.
Go to 'Recipients' > 'Mailboxes', select the user mailbox you want to modify, and click the 'Convert to shared mailbox' option in the properties pane.
Once converted, click on the newly created shared mailbox, go to the 'Delegation' tab, and add the necessary users under 'Read and manage (Full Access)' and 'Send as' permissions.
Return to the main Microsoft 365 admin center, go to 'Users' > 'Active users', select the original user, navigate to the 'Licenses and apps' tab, uncheck the Exchange Online or Microsoft 365 license, and click 'Save changes'.
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Frequently Asked Questions
Can I access a disabled individual mailbox without converting it to a shared mailbox?
No. Once an Exchange Online license is removed without converting it to a shared mailbox, the mailbox becomes inactive. Its data is held temporarily (usually for 30 days) and then permanently deleted, blocking all delegated access.
Do delegated users need their own licenses to access a shared mailbox?
Yes, any user who needs to access a shared mailbox or exercise delegation rights (like Send As or Full Access) must have their own active Microsoft 365 or Exchange Online license.
What happens to 'Send on Behalf' permissions when an individual license is removed?
If the underlying mailbox is disabled due to license removal, all associated permissions, including 'Send on Behalf', will cease to function. The mailbox must be maintained as a shared mailbox to keep these permissions active.
