I think it's that, plus following where the money is coming from. While it's nigh-impossible to get retail customers to pay for windows and they want to get ent

I think it's that, plus following where the money is coming from. While it's nigh-impossible to get retail customers to pay for windows and they want to get enterprise used to the idea of bringing everything into their 365 services, windows will be seen as a loss leader for other parts of the business, which includes advertising. Similarly I think google's purchase of doubleclick had a large influence over the years, android and chrome were in part ventures to present their ads.