wow, yes, that worked brilliantly. Well done and thank you. How on earth did you find that out?
The web app that I'm using is the Blackberry Browser and it goes to the T-zones home page (same home page it went to on my Sony Ericsson I just gave up in favour of a personal 8800). There was an "email settings" icon (I've hidden it) that will take you to BlackBerry Internet Service
where you adapt your settings. I had no w'n'w icon like I did on my SonyEricsson, and assumed the Bberry Browser is the access to w'n'w...
Hope this helps in some way!