Exchange 2007 Delivering to Outlook 2010 Junk Folder

One user on the domain is having random emails, from both internal and external addresses, delivered into the Outlook Junk Folder rather than the Inbox.  We have reinstalled Office, disabled the Outlook Junk filter in the Registry, Accessed the user's Exchange account from a different user account on the system, and confirmed all updates.  The email content is broad ranging as you would expect from a wide range of senders.  Even when the user is on the Outlook white list some of their email may get redirected to the Junk folder.

We have also turned off all Exchange content filtering (we have a front end spam filter service).  So, Exchange should not be redirecting the emails.

Since the problem continues after a reload and when another user account is used to access the problem Exchange account, we are suspicious of Exchange, but how would it send email to the user's Junk folder, not the email address defined for junk email?

The user environment is:

Windows 7 Pro, Outlook 2010
SBS 2008, Exchange 2008+SP3

Thanks for any ideas!