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Two quibbles: first, I'd argue that DOS, Windows 3.x/9x/ME, Windows NT are three separate OSs. Ditto MacOS and OSX.

Secondly, I think we're in agreement about the 'dominance for decades' thing. I should have said "Very, very hard ... and will take a long time."

Think of ITS, Symbolics, VMS, HPUX, Solaris, PalmOS, CP/M, OS/2 ... all once popular, now consigned to the dustbin.

Which of those ever had anything close to a 'dominant market position'?

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