Forget the OWA approach. You have to get the "Desktop" running again as it was before. OWA doesn't have all the functionality and don't try to mix the two things, either.
Create a new BES admin account as knotty says. If that doesn't help, given the many things you have already done that might have made things worse, create the BES from scratch. It doesn't take that long (definitely not a week as you are in a small company).