As of now it isn’t the best mobile OS, IMO, but it is on a path to be the best mobile OS in 2017-18.
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I don’t know how you get that. iPhone and Android is it. There’d have to be some nuclear warhead exchange for those to be replaced by anything, even Windows.
What was your first job in 1980?
Being the best doesn’t always equate to being the most popular. No doubt that Android and iOS are firmly entrenched, especially Android. It isn’t obvious to many yet, but Apple is in a very precarious position with the absence of innovation to sustain the magic. Microsoft and OEM partners are focusing on mobile solutions for the enterprise and professional class users, a la the Surface product line. As of now I don’t see Microsoft making phones for the consumer market, but OEMs partners, such as Acer, probably will.
In 1980 I worked as an entry-level programmer at a Sperry-Univac (Unisys) manufacturing plant.