Day-one sales totals on both continents were similar, with an estimated
total of nearly 1.2 million copies sold on the first day in North America and an
estimated total of more than 1.1 million copies sold in Europe within the first
24 hours of launch(a). By the end of the first day of availability on both
continents, a total of more than 1.7 million players had already logged in and
upgraded World of Warcraft to play The Burning Crusade.