Is your device still connected to a corporate BES system? Or did you buy the device used and it's been like that ever since you got it?
If it's your personal device and not connected to a corporate BES system then you can remove the IT policy on it. I recommend upgrading to OS 4.5 and then using Method 1 of this post:
http://www.blackberryforums.com/gene...ve-policy.html