Stop pulling mail off of Exchange!!

[Outlook, eh?]

Hey All,
I have had the misfortune of setting up REMOTE users over VPN and once
Outlook is installed it pulls all of the pre-existing mail off of the server
and onto their machine. Luckily I have been burned before by this and make
backup .psts of all of their online mail and just refill their folders and
change where new mail is delivered (to the Mailbox - Username).

However it's a new year with "change" on the horizon and was looking to see
if anyone has any ideas on how to make this behavior stop, so that when
Outlook is configured on a REMOTE machine for the first time the mail stays
in the user's Mailbox?

Thanks!
Bryce