I have been useing the NotifySync on my 8830 with my exchange provider Hostlabs as a Bata tester. I am very happy with the results and the savings on my Mobile bill. I still will have to pay the usual $10 dollers amonth with my exchange host but i do not have to subscribe to the BES plan with my phone provider which is very cool
I only need the basic data plan for internet and Text and i can Sync all my Outlook folders to my device just as if i was on BES. It basically uses the same protocls as a MS smart phone and connects through activeSync.
I am sure my provider would be happy to give you a test run they are very friendly and helpful for all my office messaging needs.
Hope that helps