Modern Warfare 2 players on both Battle.net and Steam will need to register a number.
During Modern Warfare 2s beta in September, more than 20,000 accounts were banned.
The company didnt specify then that only PC players would be the only ones needing to register.

Oh well, as Grahamnoted, at least we get 4K and support for ultrawide monitors, right?
Call Of Duty: Modern Warfare 2 ziplines ontoSteamandBattle.neton October 28th for 60/$70/70.
you’re free to read the full Ricochet progress report blog posthere.

Microsoft alsointend to buyActivision Blizzard, although the deal iscurrently under investigationby UK regulators over competition concerns.