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Your statement is actually false. MS Windows may be the most widely used OS "on the desktop", but if you prefer to count overall installed base or number of users, then the Japanese TRON is the most widely used OS in the world - it's just it's pressence isn't as obvious as MS Win's one, as it's an OS designed to be embedded into appliances such as cell-phones, hand held translators, electronic agendas, public phones, teller or vendor machines, etc.