Call of Duty on Steam. Welcome to Call of Duty HQ, the home of Call of Duty: Modern Warfare III, Call of Duty: Modern Warfare II and Warzone!". Recent Reviews: Mixed (14,353) - 49% of the 14,353 user reviews in the last 30 days are positive.

In a new filing from Microsoft detailing the company's post-trial findings  and conclusions  after its recent victory in court against the Federal Trade Commission the Xbox maker revealed that Call of Duty leaving Steam was part of an Activision plan to grow Battle.