Since someone inflicted silence on our XI experts, let me explain it to you as a humble shepherd. FF XI was a glitch. It was never intended to be released outside of SE building, but due to some virus disaster(idk) it escaped and spread through the world. FF fans were desperately trying to rename it to FF online or something like that so it wouldn't polite their beloved main series with the number XI. But all efforts were in wain. Today the virus is weakening, but the ill prophecy says it will return once again as the FF XIV.