Microsoft has NOT developed a single application on its own. They are a marketing giant. Every program that Microsoft now holds the distribution rights to was once owned and developed by another company. Due to business owners wanting to extract every last drop of use out of their investment in computer hardware and software, every new OS has to be backward compatable, which they are not, and they continually write software to protect the user from themselves, which cripples the power user and the technoly savy people. Ask any computer support person about the different platforms and os's and software that they are supporting for business. There are still businesses out there, small, which are still running DOS and Lantastic, and operating there store profitably. The owners do not want to invest 30 to 50 thousand dollars to upgrade hardware and software to the latest buggiest software.
Bill gates is not evil, he is a great marketer, and a savy trader, (thief), depends on your point of view, who has built a large dominating company for the time being.
An operating system should be small, compact, and efficent. Windows is none of this. Windows is the swiss army knife, looks great, kinda useful, but the actual tools would be better.