Deleting Exchange 2010 Mailbox also Deletes AD Account

I have someone working in my team that has a task of taking care of accounts from separated users.  Whenever he removes a mailbox in Exchange 2010 the user's AD account is also deleted.  We need to be able to retain the AD account and keep it disabled.  

What needs to be done?
iNetSystemAsked:
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Nick RhodeConnect With a Mentor IT DirectorCommented:
Delete and Disable get confused here when it comes to the mailboxes.  Delete on exchange removes the mailbox and deletes the AD account.  Disable will move the mailbox to the disconnected state and from there you can delete the mailbox or wait for exchange to purge it (typically 30 days or so)

So if you wanted to disable the user account and delete a mailbox you would disable the user in AD and disable the mailbox in exchange.
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Will SzymkowskiConnect With a Mentor Senior Solution ArchitectCommented:
As NRhode has stated above this will not disable the Active Directory account so you will need to make sure that the account is disabled as well if this is what your intent is.

Will.
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Yancey LandrumTechnical Team LeadCommented:
Your team member needs to disable the mailbox first; that will detach it from the AD account and remove all Exchange attributes from the account:

http://technet.microsoft.com/en-us/library/aa997210(v=exchg.141).aspx

He could stop right there and the mailbox will delete on its own after 30 days.  If you need it gone sooner, he can then use the Remove-Mailbox cmdlet:

http://technet.microsoft.com/en-us/library/aa995948(v=exchg.141).aspx

So if he runs the Disable-Mailbox cmdlet first, he can then use Remove-Mailbox with the Database and StoreMailBoxIdentity parameters. Since the mailbox was disconnected from the AD account by the first command, the second command will not delete the AD account.
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Yancey LandrumTechnical Team LeadCommented:
Oh, too slow!
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