Office 365 Terminated/ReHired Employee Mess

I'm currently working with a company where AD really hasn't been taken care of. No policy on deleting terminated users etc... simply disable the AD account and leave the mailbox there which continues to receive email. :sigh:

So now that users are migrated to Office 365, the dilemma is that an employee was terminated, then later rehired back. So the AD account was enabled and a new mailbox created so now I have a DirSynced old mailbox for the user in O365 which is getting the email, but the user cant receive it because his new mailbox, same email address, is on premises... Is there a way to force a mailbox deletion in the cloud so I can then migrate the 'new' mailbox to O365?
Christian HansAsked:
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Vasil Michev (MVP)Commented:
Remove the Exchange license for the cloud user and use the Disable-Mailbox cmdlet with the -PermanentlyDisable switch to purge the cloud mailbox. Of course, make sure to backup any important data first.
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Addy NadiaExpertCommented:
To hard delete the synced user, we need to perform the following cmdlets using Azure PowerShell.
remove-MsolUser -UserPrincipalName TestUser
remove-MsolUser -UserPrincipalName TestUser –RemoveFromRecycleBin
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