Blizzard has announced that their World of Warcraft: The Burning Crusade expansion sold a whopping 2.4 million copies during the first 24 hours in North America and Europe, making it the fastest selling PC game of all time. 1.2 million copies were sold in North America, while 1.1 million were sold in Europe. The rest was sold in Australia and New Zealand, and a few Asian countries. Blizzard has already shipped more than 4 million copies of the game to retailers, who still can’t guarantee that there will be enough games for everyone.

Mike Morhaime, president and co-founder of Blizzard Entertainment, says:

“The Burning Crusade has already exceeded even our most ambitious expectations. We’re pleased that so many players are eager to see all of the new content that the expansion has to offer, and we look forward to seeing everyone online as additional players continue to upgrade in the days ahead.”

Earlier this month, World of Warcraft surpassed the 8 million subscribers mark, making it by far the most popular MMO today.