Twelve years ago Microsoft bought Bungie, a small, Chicago-based maker of hard-core games. Outraged fans claimed its upcoming Halo game would be watered down. Not so much. After seven titles and 43 million copies sold, the Halo series it created is a profit machine. (Estimated at under $40 million, the Bungie buy is arguably Microsoft's most successful ever -- sales have reached an estimated $3 billion.) Here is a look at the massive moneymaker's evolution (and total sales).
Halo
Date: Nov. 15, 2001
Sold: 6.43 million
Coinciding with the launch of Microsoft's first console, Halo: Combat Evolved sold 1 million units in just under five months, a record.
NEXT: Halo 2