I'd argue the opposite. All Microsoft did was understand what the world needed. Were they successful because of their great marketing or their flawless coding? No. Was Windows spread like a wildfire because it solved real world problems? Yes. Is it one of the most, if not the most, influencial software ever made? Yes, no matter how dull and incompetent people might say it is. For the accountants out there, school teachers and doctors, it was magic.