Deleleted a defective mailbox in exchange 365 and re-created a new MB for the user. Now need to recover some emails from the deleted MB.

Yossi Nagel 21 Reputation points

Question is: if i restore the deleted MB, would it run over and override the new MB i had created for my user? Is there a way to restore to a PST or to change MB user name?


Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Lucas Liu-MSFT 6,161 Reputation points

    Hi @Yossi Nagel ,
    How did you recreate a new blank mailbox for this user?

    According to my test in my lab environment:

    1. I soft-delete user EXO4 mailbox, then I could view it in the Deleted users in Microsoft 365 admin center.
    2. Then I create a new user named EXO4 in Microsoft Azure and assign Microsoft license for this user. I logged into the mailbox of the newly created user EXO4 and found that there was no data in it, it was a brand new mailbox.
    3. Then I try to restore the deleted user mailbox EXO4 in Deleted users, I get the error shown in below screenshot. After that, I changed the primary email address to EXO4-1 and successfully restored the mailbox, and then assigned the license.
    4. After logging in to the EXO4-1 mailbox, I found that the previous emails were successfully restored.

    If you are worried that the restoration will affect your new mailbox, you can back up the mail in your new mailbox in advance.
    For more information: Backing up email in Exchange Online

    In addition, the retention period for soft-deleted mailboxes is 30 days. Please make sure that the mailboxes you deleted before have not been deleted permanently.
    For more information: Delete or restore user mailboxes in Exchange Online


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