Stop! If you're running Exchange 2003 then just use BIS. You'll have to get rid of the Redirector (uninstall and reinstall Desktop Manager with the Internet option). Then go to the email setup icon on the BB and fill in the info for the account on the Exchange server. If you're hosting your own internet email on the exchange server and also have OWA enabled and working to the outside world, this will work because BIS uses OWA conduits to get your email.
BTW, here's the link if you don't want to do the email setup through the email icon on the BB. https://bis.na.blackberry.com/html?brand=vzw
Be aware that this link is for Verizon customers.