Britain's antitrust watchdog said on Wednesday it had started an investigation into Microsoft $68.7 billion (roughly Rs. 5,431,35 crore) deal to buy Call of Duty maker Activision Blizzard.The Competition and Markets Authority (CMA) said it had until September 1 to make its phase 1 decision on whether the deal between the US technology company and video-game maker Activision would reduce competition in the UK.The phase 1 investigation by the CMA will either lead to the deal being cleared or will move to a more in-depth phase 2 probe.