Exchange 2010 - attach mailbox to another existing user?

A user is leaving the company but will be returning to the company in a new role, and will be requiring a new mailbox and smtp address in their new role. But they'll be using the same AD account associated to their new mailbox.

is there anyway I can attach the person's old mailbox from their former role to a different, existing user, who just wants to have it attached as a separate mailbox in their Outlook?

Is the only way to do this to mailbox export as PST and attach to the person who needs access to the mailbox, then remove the malbox from Exchange and re-create for the returning user's existing AD account?

Or should I create a new "shared" mailbox, then export/import the employee's former mailbox and import it into the new shared mailbox?
Or, create a new disabled user like "former_employee", and disconnect the mailbox and reconnect it to the new AD user, then create a new mailbox for the employee's existing AD account
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
You already know better options which you can choose whichever is comfortable for the user and yourself without violating the policies of you company .

a) Export the mailbox to .pst and Disable the mailbox (when you disable the mailbox become orphan) You can you can re-connect with any other user account before the tombstone period expires. Check if the time taken to rejoin is too far.  
b) When user rejoins create fresh mailbox with existing user account and handover it to him, You can create temp id and attach to old mailbox and keep it handy, you can even disable that user account.
c) He can connect either as additional mailbox or attach additional mailbox or if he wants all mail in his new mailbox import the pst.

It depends on scenario which fits your environment policies and procedure and decide accordingly.

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garryshapeAuthor Commented:
Thanks I appreciate it. I couldn't remember the details on disconnected mailbox, and realized that it can only be reconnected to an AD account that didn't have a mailbox.

For now I'm creating a shared mailbox, and imported the exported PST to it. Hopefully this will allow for easier transition into a general shared mailbox as to steer the department away from relying on a user-based mailbox for email concerning a department.
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