Thanks for all the answers. The result is what I was afraid of though. Wending have BES. I get my email using program called Astrasync which runs an active sync protocol to the OWA portal. So it would show as data. A year or so ago when I had an unlimited TMo plan they didn't bill it as data. But I understand that they could at any time so that is a bit dodgy.
Actually, for Europe the current VZW plans aren't bad for BBs. I only use a couple Mb a day on a BB. I checked before leaving for the UK last Monday and my Android phone is, not surprisingly, using like 30 times as much data.