How to Restore a Hard-Deleted Exchange Online Mailbox
Question details
The user needs to determine whether it is possible to recover a cloud-only Exchange Online mailbox that was hard-deleted approximately 30 days ago.
- Product
- Microsoft Exchange Online
- Device & OS
- not provided
- Scenario
- Attempting to recover a deleted user's mailbox data after the standard 30-day retention period has expired.
- Observed behavior
- The mailbox has been hard-deleted and is permanently removed from the active Exchange environment.
Verify the exact date the user account was deleted, as Microsoft 365 natively retains deleted mailboxes for exactly 30 days unless a specific retention policy or litigation hold was previously applied.
Restore within the 30-Day Recovery Window
Use the Microsoft 365 admin center to restore the deleted user and their associated mailbox, provided it has been less than 30 days since deletion.
Exchange Online mailboxes are soft-deleted and kept in the Azure Active Directory recycle bin for 30 days. Restoring the user account within this window will fully recover the mailbox.
Log in to the Microsoft 365 admin center using a global administrator or user management administrator account.
Go to the left-hand navigation menu, click on 'Users', and then select 'Deleted users'.
Find the deleted user in the list, select their name, and click the 'Restore user' button in the flyout pane.
Ensure an appropriate Exchange Online license is assigned to the restored user to make the mailbox accessible again.
Recover Data from an Inactive Mailbox (Litigation Hold)
Retrieve mailbox data if the organization previously placed the mailbox on Litigation Hold or applied a Microsoft 365 Retention Policy.
Restore Using a Third-Party Backup Solution
Use external backup software to recover the mailbox data if the 30-day native retention period has expired and no holds were in place.
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Frequently Asked Questions
What exactly happens to an Exchange Online mailbox after 30 days of deletion?
After the 30-day soft-deletion period, the mailbox is permanently (hard) deleted from Microsoft's servers. Unless a litigation hold, eDiscovery hold, or Microsoft 365 retention policy was applied beforehand, the data cannot be recovered using native Microsoft tools.
Can I recover a mailbox if the associated Azure AD user was permanently deleted from the recycle bin?
If the Azure AD user is manually deleted from the recycle bin (hard-deleted) before the 30 days are up, the mailbox is also hard-deleted. You can only recover the data if the mailbox was placed on hold, making it an inactive mailbox, or via an external backup.
How do I check if a deleted mailbox was placed on Litigation Hold?
Administrators can verify this by accessing the Exchange admin center, navigating to the 'Recipients' section, and checking the 'Inactive mailboxes' list. Alternatively, PowerShell can be used by running the 'Get-Mailbox -InactiveMailboxOnly' command to see if the deleted mailbox was preserved.
