I got the Warlord Edition, which has the Mongols on it. I have tried registering and logging on from their website but I did not get in, as I said before. Maybe something with the server.

I feel that Medieval is basically like Shogun except with improved campaign map, troop diversity and deeper diplomacy (somewhat). The tactical engine is a lot worse, however, the graphics and effects are bad (compared to how Shogun looked) and it runs a lot smoother, as I can play with sound turned ON and with no slowdowns (unlike Medieval). However there is just something about the campaign map in Shogun that I find nauseating (this is not an overstatement) and it is almost a deterrent from playing the game any length of time before I return to Medieval for a more satisfying campaign experience though less satisfying battles.