Not just marketing :(
Don't forget illegal contracts and illegal linking of advertising dollars to good technical reviews (both were adjudicated in the late 80's and mid 90's). Most people don't remember, for example, that the original working name of IBM OS/2 was Windows 4 and when IBM rolled it out they were bashed for shipping buggy software. MS shipped Windows 95 two years later and it was hailed as a gret leap forward with ten times the bug list.
Before everyone starts trashing back - I do use and support Windows but also have used most of the alternatives at one time or another. Each has some strengths and weaknesses. We now choose to accept the weaknesses of Windows.
