Extracted from the SE P910i Blackberry user guide ....
"There are two versions of the BlackBerry service available: one for companies with their own email server (BlackBerry Solution) and one for use with Internet (ISP) Email accounts (Instant Email with BlackBerry).
The BlackBerry service automatically pushes all incoming emails to your phone and outgoing email to your email account. In addition, BlackBerry Solution users have access to the wireless calendar functionality and wireless access to the company's global address book so they can always keep up-todate."
The software supports both versions of service (but either 1 at a time i believe).
I'm using it to access my corporate email through my P910i instead of blackberry 7100g.
What would you do if you are not afraid?