Dogg.
I'm a little confused about your question - so if you can answer some of mine I might be able to assist.
1) Is your company actually running a BES server or are you trying to integrate a corporate email account via BIS. If you're runinng a BES then what version BES are you running (speak to your IT guys)
2) If the answer to (1) was yes then have you previously had a full BB handheld working on the BES sending and receiving email
3) Does your carrier have you provisioned for BES on their network - you can't use BES if you don't pay and get provisioned for it. In the UK BIS is 20 pounds per month (approx) less than BIS.
4) have you followed the steps in the FAQ - on how to activate a connect device on a BES -
BlackBerry Connect - BlackBerryFAQ
cheers
bb