you wont be able to do it off of the enterprise. enterprose is part of the bes, which is a speacial server that you dont have.
look at the top of the device, and does it say 1XEV, all caps?
if yes, then you have a data connection you need to register the phone
menu>options>advanced iptions>host routing table>menu button>register now.
when you have registered the device, you will now have some more icons... one of them being email settings, and from this icon you can set up your email. it may ask for user name and password, and if you have the user name and password from your other device, it should be no problem logging in, and changing them over. it may even ask if you want to move your acount over, just select yes.
if no, then take the battery out for 30 sec. put the batt back in the device, and look for the cap. XEV.
if yes, then follow the steps above,
if still no, then you may need to program the phone. you can do this by calling vzw at 1800.922.0204 from another line and be able to verrify the acount