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How to Convert an Existing Mailbox to a Shared Mailbox When Name is in Use
Question details
The user needs to convert generic meeting accounts into shared mailboxes, but the UI conversion option is missing and creating new shared mailboxes fails due to name-in-use errors.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- An administrator is attempting to convert standard user accounts (meeting rooms) into shared mailboxes to free up licenses or streamline access.
- Observed behavior
- The conversion button is unavailable in the admin center, and attempting to manually create a new shared mailbox with the same name returns a 'name already in use' error.
Ensure you are logged into Microsoft 365 or Exchange admin center with Global Administrator or Exchange Administrator privileges, and that the target mailboxes are currently active.
Verify Exchange Online Licensing
The conversion option may be hidden if the target mailbox lacks the correct active Exchange Online license.
In Microsoft 365, a user mailbox must have an active license before it can be converted to a shared mailbox. If the license is missing or recently expired, the conversion option will not appear.
Log in to the Microsoft 365 admin center and navigate to 'Users' > 'Active users'.
Select the generic meeting account you wish to convert, and go to the 'Licenses and apps' tab.
Ensure that 'Exchange Online Plan 1' or higher is assigned to the account. If it was recently added, wait up to 24 hours for the licensing changes to fully propagate through the system.
Use Exchange Online PowerShell to Convert Mailbox
Bypass admin center UI glitches by using PowerShell to directly convert the mailbox type to Shared.
Resolve 'Name in Use' Error
Understand and fix the error that prevents creating or modifying a shared mailbox due to a conflicting name.
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Frequently Asked Questions
Why is the option to convert to a shared mailbox missing?
The option might be missing if the user account does not have an active Exchange Online Plan 1 or Plan 2 license assigned, or if the license was recently added and the backend sync hasn't completed yet.
Do shared mailboxes require a paid license in Microsoft 365?
Generally, shared mailboxes under 50 GB do not require their own separate license. However, to convert an existing user mailbox to a shared one, the user account must temporarily possess a license during the conversion process.
Can I use a shared mailbox name that was previously used by a deleted account?
Yes, but you must either permanently delete the old account from the Microsoft 365 recycle bin first, or wait 30 days for it to clear before the email alias becomes available again.
How do I access a shared mailbox after converting it?
Users who have been granted 'Read and Manage' or 'Send As' permissions can access the shared mailbox by adding it to their Outlook desktop client or via the 'Open another mailbox' option in Outlook on the web.
