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Fix Recovered Room or Shared Mailbox Missing from Microsoft 365 Admin Center
Question details
The user is unable to locate a restored room or shared mailbox in the Microsoft 365 or Exchange admin centers, despite the mailbox remaining accessible via PowerShell and the Outlook Address List.
- Product
- Microsoft 365, Exchange Online
- Device & OS
- not provided
- Scenario
- A synchronized Active Directory user was converted to a shared mailbox, removed from synchronization, and then restored, but cannot be visually located in the admin portals.
- Observed behavior
- The recovered mailbox does not appear in the Shared Mailboxes section of the admin center because it is actually categorized as a room mailbox, or because of a directory sync mismatch.
Ensure you have Exchange Administrator or Global Administrator privileges in your Microsoft 365 tenant, and verify that directory synchronization is actively running without errors.
Verify the Specific Mailbox Recipient Type
Different mailbox types appear in different sections of the Microsoft 365 Admin Center. Verifying the exact recipient type prevents searching in the wrong category.
A common oversight after restoring mailboxes is assuming the recipient type is a shared mailbox when it might actually be a room or equipment mailbox.
Navigate to the Microsoft 365 Admin Center or Exchange Admin Center using your administrator credentials.
Instead of only checking the 'Shared mailboxes' list, navigate to 'Resources' to check if the missing object is listed as a room or equipment mailbox.
Run the 'Get-Mailbox' cmdlet in Exchange Online PowerShell to confirm the exact RecipientTypeDetails property of the missing mailbox.
Properly Restore and Sync the Deleted Cloud User
Follow the correct order of operations to restore a deleted synchronized Active Directory user to ensure it appears in the admin center.
Simplify Your Workflow with WPS Office
While managing Exchange mailboxes requires Microsoft 365 admin tools, you can handle all your daily document needs with WPS Office. It is a free, lightweight, and complete office suite that seamlessly replaces Microsoft Word, Excel, and PowerPoint.
- 1. Visit the official website: Go to the official WPS Office website to find the correct version for your operating system.
- 2. Download the installer: Click the download button to get the free installer package.
- 3. Install and launch: Run the installer, follow the on-screen prompts, and open your existing Microsoft Office files instantly.
Frequently Asked Questions
Why is my restored mailbox not showing up in the Microsoft 365 admin center?
It may be categorized as a different recipient type, such as a room or equipment mailbox, which appears under the 'Resources' section instead of the 'Shared mailboxes' section.
How long do I have to restore a deleted mailbox in Exchange Online?
You have up to 30 days to recover a deleted mailbox. After this period, it is permanently deleted, and you will need to contact Microsoft Support to explore potential backend recovery options.
Can I view a missing mailbox using PowerShell if it doesn't appear in the portal?
Yes. Sometimes directory synchronization delays or recipient type mismatches hide the mailbox in the GUI portal, but it remains fully queryable and accessible via the Exchange Online PowerShell module.
What is the correct order to restore a synced Active Directory user?
First, restore the deleted cloud user from the Microsoft 365 admin center's 'Deleted users' section. Next, move the on-premises account back into the synchronized OU, and finally, run a directory synchronization.
