For those who are interested here is the link of the history of Azeroth. A Very interesting read and would recommend you read it as it explains a lot of things in game (including Outland, the War of 3 Hammers, the First and Second Burning Crusade, Illidan, Malfurion and much much more) a must read for any serious WOW fan.
http://www.worldofwarcraft.com/info/story/chapter1.html;jsessionid=928880649A623FA18B7F09730462FFBE.app07_06