Honestly, I don't know a ton about it. Maybe BIS is the wrong term?
The blackberries somehow use OWA to connect to their exchange mailbox and sync mail. They use a blackberry web interface to setup the connection.
Once we get the list I am not sure what it would matter, since to block it we would have to turn off their OWA access, which we do not want.
Darn HR and their difficult requests.