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How to Recover a Deleted Office 365 Mailbox

1. Launch Powershell as an Administrator

2. Connect to Office365 via the CLI (You can't do this from the GUI/Browser)

3. You will need both GUID's to move the old mailbox data that was soft deleted to the new mailbox that was created.

NOTE: Background on how this would be applicable. The reason you would have to do this is if you had a local hybrid Active Directory and you did not migrate one mailbox to Office365 or whatever other reason you had a local mailbox stuck on the local exchange DB. You deleted the mailbox in OWA and Microsoft Active Directory Sync wiped out your Office365 account because the local AD account was wiped/deleted when you were fixing the OWA on-premise. You created a new account and when it was replicated to Azure Active Directory and you enabled the Mail license, you now need to copy the data from the old mailbox to the new Mailbox. Either way, you have a new mailbox and the soft deleted data needs to be migrated/copied to the new mailbox.

4. Informational. Your ExchangeGuid is not the same as the account Guid. Don't mix them up.

5. Get-Mailbox -SoftDeletedMailbox

6. Get the GUID's of the Old and New Mailboxes

Get-Mailbox -SoftDeletedMailbox -Identity cchicken | fl *guid*

Get-Mailbox -Identity curry.chicken | fl *guid*

7. Merge the old data into the new mailbox

New-MailboxRestoreRequest -SourceMailbox aef196y7-9036-4bec-b63b-f34re8rv6705 -TargetMailbox 0a897d6d-67a9-4ff8-a79d-k64rsvb678a3 -AllowLegacyDNMismatch

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