I just installed BES Express last week to run in tandem with my Exchange 2007 server (though BES is on a different machine), and thus far have only synced up two handsets thus far. Both phones are wholly owned by the employee, and this is simply a means for them to be able to easily access email/ calendars on the go. One of the users has been loving it, but the other person noticed their personal contacts showing up Outlook. They then proceeded to delete the personal contacts from Outlook, thus deleteing them from the Blackberry too.
So, is it possible to flag contacts/ calendar events to NOT sync up with the BES/ Exchange servers? I'm not seeing that option in the BES Express server, and I don't have a BB handset myself to check this.