Outlook 2007 items moved to personal folders reappear in Exchange account inbox

I support 20+ users all running Vista Ultimate and Office 2007.  All systems are fully patched.

We use Intermedia.net for Exchange hosting.  All my users run Outlook 2007.  All were configured using a configuration program from Intermedia.  All are using Cached Exchange Mode.

One of my users is religious about keeping his inbox clean.  As part of this he moves alot of his email to personal folders.

Periodically email he has previously moved to his personal folders reappears in his Exchange account inbox.  Periodically as in every once in a while from time to time.

Today 50 or so such messages magically reappeared.  These messages also still may be found in the personal folders.

We also checked his Exchange account via OWA.  The reappearing messages appear in the Inbox as presented via OWA.

I was thinking it might somehow be related to cached mode, but of my 20 users this one is the only problem child.

He is also a BlackBerry user, but then again so are about 6 others.

Your thoughts, questions and comments are appreciated.
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Check the BB device.  I bet when he deletes them from his desktop, they are not being deleted from the BB and its putting them back in.  The BB should be set so that in a conflict, the desktop wins (Don't recall politically correct term).

This almost always points to mobile device setup/issues.

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