How many MW2 copies have been sold?

14 million.

Since its release, on November 10 2009, Call of Duty: Modern Warfare 2 (or MW2) has sold more than 14 million copies around the world (source: Activision website). As reported by the NY Daily News, only in North America and the UK 4.7 million MW2 copies were sold in the first 24 hours since its release, which represents earnings of $310 million.