If you delete the Mailbox from Exchange, it will delete AD account associated with it. So administrators will get very often confused.

So we need to Run Disable-Mailbox to remove mailbox and Exchange properties which will not delete the AD Account.

To remove the mailbox

Run Disable-Mailbox -identity <Mailbox ID>

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if you run, Get-Mailbox -Identity Administrator, You will get an Below Error as there is no Mailbox Associated with it

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Now you will create another mailbox for the same user without any issues,

Open Exchange admin center–>Recipients–> Mailboxes–> Click on User Mailbox

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Click on Browse

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Select Administrator(Ad User)

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Click on More Options
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Select the Mailbox Database 

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So we have seen how to disable mailbox and recreate the mailbox for the same AD User.

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