Unable to access mailbox on some machines, not others. Outlook 2010.

I've been having a very annoying problem with one of my employee's mailbox.  Unfortunately, there hasn't been anything that was installed or run that might have caused this that I can tell.

The biggest problem is that this issue is repeatable on 2 laptops (a Lenovo w510 and t410).  However, I attempted to add his account on my machine (another w510) and everything worked fine.

What is happening is once I add the account information through the new account wizard, it checks the "Establish Network Connection" and "Search for josh@XXX.com server serttings" then hangs on the "Log on to server" eventually resulting in an error message stating "The connection to Microsoft Exchange is unavailable.  Outlook must be online or connected to complete this action."

Per Microsofts support, I have confirmed that all registry settings for RPC are correct and that the RPC file versions are correct.  I have deleted OST files, blown away profiles, repaired Office and eventually uninstalled and reinstalled Office.

I have run get-casmailbox on the server just to make sure MAPI was enabled (it is).  I'm currently at my wits end...  I can get his mailbox fine on my machine, and he has access to his mailbox using OWA with no problems.

Is there anything else I can try?  

Cypher300Asked:
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Hendrik WieseConnect With a Mentor Information Security ManagerCommented:
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Cypher300Author Commented:
Yeesh, I was trying to avoid that exact possibility.  Welp, time to do a little backing up...
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