I think it came out back in 2006
This is because even if you have not signed your account up for burning crusade you have only downloaded it.
Burning Crusade (and Wrath of the Lich King) is an expansion pack to World of Warcraft. When you upgrade to Burning Crusade/Wrath of the Lich King, you are actually upgrading your account, not the software. The client is automatically updated when expansions come out.
You cannot end a Burning Crusade trial, but why would you need to?
When you purchase World of Warcraft, you automatically receive The Burning Crusade with it as Blizzard recently merged the two. There is no more free trial for Burning Crusade.
If you upgrade from basic wow, to Burning Crusade, yes, you get a free month. Same goes for if you upgrade from Burning Crusade to Wrath of the Lich King.
Yes. The Burning Crusade is an expansion pack, meaning it takes the original and adds to it.
There is no expansion Burning Legion. The expansions are (in order): Burning Crusade, Wrath of the Lich King, and Cataclysm.
You cant play Wrath of the Lich King without the Burning Crusade. The only way to play blood elf or dranei is to buy Burning Crusade. You also wouldn't really be able to level your character from 60-70 without the leveling areas in the Burning Crusade.
You do not need the internet to actually install the expansion Burning Crusade but you will need the internet to update and play it.
The Burning Crusade is the first expansion back for Blizzard Entertainment's World of Warcraft game. It adds new races, zones, and professions.
Yes you have to download the whole game and its patches before you can upgrade to the Burning Crusade.
Yes, It allows you to teleport to the previous worlds such as burning crusade.