I’m not sure if taxing the income of wealthy people will do much good.
By definition, wealthy people already have wealth. This means two things:
Hard to reconcile the title of the article with the body of your post — which goes in all directions, and never quite articulates why, in your opinion, Microsoft is a monopoly. They are hardly a monopoly:
OS market share: http://gs.statcounter.com/os-market-share