Re: 230 Million
"At say $50 each that is $11.5 billion Microsoft gave away."
No, it's not.
Windows is a tiny part of MS's overall income. Office accounts for the _VAST_ majority of their income.
It's in MS's interest to keep people using Windows even if they have to give it away, as long as they buy other products (loss leaders).
What keeps them awake at night are things like Libre Office and people installing Linux.