> Further, America has definitely been pumping money into Microsoft, for instance with hefty defense and public administration contracts. It is incredibly naive to believe that the US allowed the Microsoft monopoly to corner the office market without the opportunity of establishing a digital hegemony being a significant factor.

That's not a subsidy. That's a customer paying for a product. Apart from that, the USA has Anti-Trust laws, and Microsoft has been at the receiving end of these in the past.