I have had a Blackberry attached to my hip for longer than I care to remember (before that it was a motorolla pager, yick). As a systems administrator, email alerting from exchange has been a functionality that I must have working without too many issues or too much hassle. Missing an alert email to 4 am is just not an option. However the call of an real smart phone was just too much for me and I decided to get rid of my blackberry and get the HTC G2, after talking to several folks who use TouchDown for connecting to Exchange.