They were the market leader for PC operating systems since they entered the market with MS-Dos and managed to preserve that monopoly after the transition from T

They were the market leader for PC operating systems since they entered the market with MS-Dos and managed to preserve that monopoly after the transition from TUI to GUI. And later they expanded into applications as we know today and built monopolies for email, texts, presentations, spreadsheets and browsing the information superhighway. All prior art, indeed, near zero innovation. The accountants love it.