First of all, I never recommend putting your personal device on a company BES. The company can , and many do, lock it down tight and limit what you can and cannot do. Their IT policy may preclude you from using gmail and to connecting to your PC to sync calendar and contacts.
You really should talk to the BES Admin about the company polices, etc.
You also need to understand what the company can see about your use of the device.
What can a BES Administrator
What does BES see; what can be tracked/logged? - Port3101.org : Your BES Connection