# Restoring Exchange Mailbox Using Stub Rehydration

You can detect and replace stubs with restored messages in user mailboxes in all Exchange environment types.

## Procedure

1. From the Command Center navigation pane, go to Protect > Microsoft 365.

   The Microsoft 365 Overview page appears.

2. On the Apps tab, click the app.

   The Overview page of the app appears.

3. On the Mailboxes tab, select a mailbox or All public folders, and then at the right area of the page, click Restore > Restore messages.

   Backup content appears in a list format for the mailbox or all public folders.

4. From the list, expand the folders to locate the items you want to restore, and then select the items.

   You can use the Search bar to filter mailbox contents and find the items you want restore.

5. At the top area of the page, click Restore.

   The Restore options tool appears.

6. On the Destination tab, leave Exchange Online selected, leave Restore the data to its original location selected, and then click Next.

   The Options tab appears.

7. Beside If the message exists, specify which items to include in the restore:

   - To not overwrite existing items, select Skip.

   - To overwrite existing items, select Unconditionally overwrite.

8. Specify additional details for the restore, and then click Next:

   - To include deleted items in the restore, select Include deleted items.

   - To restore to the email address selected for restore, select Match destination user based on the email address. If you leave this option cleared, the user is matched based on the user GUID.

   - To detect and replace stubs with restored messages, select Stub rehydration, and then select from the following options:

     - To replace all stubs in the mailbox with the actual data, select Recover Stubs.

     - To view reports, select Stub Reporting, and then select Mailbox level reporting or Email level reporting.

       The report includes a summary of information such as the folder name, number of stubs, message size, and scan status. The report can be located in the shared job result folder or the local job result folder of the access node machine. By default, the path is \\machinename\sharejobresultfolder\Jobresults\CV_jobResults2\2\restorejobid. - To replace stub recall link with a new link, select Update recall link.

   The Review tab appears.

9. Review the items you selected for restore, and then click Submit to start the restore operation.

   The Summary tab appears.

10. Click Close.

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