No. You got the BlackBerry Professional Software, which comes with 10 licenses by default and you can go upto 30 users. Upgrading to Enterprise Edition can be done by installing a "service pack" which is free of cost.
Just to avoid confusion this is entirely incorrect. BPS ships with 1 not 10 users, and if you want to update it to Enterprise Edition you'll need to purchase a "BES update key" which is basically a special 5 user CAL that alters all your existing CAL's from SBE to Enterprise Edition.