Exchange 2010 Mail Contact Mail user

We created a mail user under Mail Contact in EMC for a user whose mailbox is in his own company.  Doing this step also created his account in our Active Directory.

What is the best way to bring his mailbox into our mailbox server with minimal impact to the user?  I am thinking the below steps and want to run by someone who has done this before:

0. Export his mailbox to some PST file.
1. Go to Mail Contact in EMC and delete his mail contact.  This should keep his account in AD, right?
2. Create a new mailbox and link it to his AD account.
3. Schedule a downtime, and open up Outlook and import his mails from the PST file to the new mailbox in our mailbox server.

Who is Participating?
Scott CConnect With a Mentor Senior Systems EnginerCommented:
0.  Correct.
1.  The correct method now for removing a mailbox (in Exchange Management Console), but keep the AD account, is to ‘Disable’ the mailbox. Disabling the mailbox will remove the Exchange attributes and disconnect the mailbox from the AD user account. The user account will remain intact in AD, and the disconnected mailbox will be purged after the mailbox retention period expires.
2.  Correct.
3.  Correct.
nav2567Author Commented:
Actually, I misunderstand the request and I am going to send another question and grant point to this question.  

Thanks for your help!!!
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