Restore a Soft-Deleted Mailbox

In the case when an account was deleted and the mailbox was orphaned, you can create a new account, then link the old mailbox to the new account.

Prerequisites

These commands require the ExchangeOnlineManagement module.

Commands

Get the ExchangeGuid from the source and target mailboxes

$SourceMailbox = (Get-Mailbox -SoftDeletedMailbox [email protected]).ExchangeGuid
 
$TargetMailbox = (Get-Mailbox -Identity [email protected]).ExchangeGuid

Run the restore

New-MailboxRestoreRequest -SourceMailbox $SourceMailbox -TargetMailbox $TargetMailbox -AllowLegacyDNMismatch