Something nobody except MicroSoft and Unix ever had, and the prime reason why all other OperatingSystems failed miserably.

''What about MacOs?  Perhaps that's more of a regiment than an army, especially compared to Windows, but the number of Mac users out there is not insignificant.''

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Yes, marketing is important.  Something engineers often forget.  A great idea kept in an ivory tower is just a titillation for its keeper, not something useful to non-specialists.  See EngineeringVsMarketing.