I can't answer the verichat stuff, but I can answer the bes & bwc.
You can have bwc mail and bes mail on the same handheld if the bes admin permits it. It will allow you to compose a mail from either account, recieve mail from both accounts, utilize folders to have two inboxes and read accounts seperatly.
Check with your admin to see what their policy is on this. Is it your device or a company device?
We have two rules one for company devices and one for individual owned and payed for devices...least right now...
my question is: can I use both my own personal email and the companys email at the same time? meaning, if I get email through BWC, when I reply, will it be my BWC reply-to email address, and if I get email from BES, when I reply, will it be from my company email address? or do I only get to have one reply to address when I respond from my blackberry?