Hi, i recently bought a mac off of eBay, 1.83Ghz 2GB RAM 60GB Hard Drive. It came with Tiger pre-installed, but after seeing some of the features of leopard I have decided to upgrade. I was looking at some of the deals online and came across some sites selling for £35. But they have something about education licenses and 100-999 licenses and I'm confused. Are they all the same? If I get the education one will it have any separate features?