1. Email handling. Multiple accounts all being pushed automatically and instantly to your mail folder.
2. Reliability. The more my Treo froze up, the less I could rely on it. I need reliable communication, not a toy that may or may not be working at any given time.
3. Integration of PIM functions. Mail, Address Book, Tasks, and Calendar all work beautifully together. Add in some of the
REXwireless apps and you have a dominant platform.
Although the BB platform has some multimedia capabilities, they're rudimentary. The camera is mediocre, the music player serviceable but unremarkable, and the web browser is poor. If these are where your priorities lie then you might be better served with something in the Nokia N-series genre.
But if it's industrial strength communications and security you care about, Blackberry has no equal.