As I noted elsewhere, I have a small Chuwi tablet that dual boots Android and Windows 10
This opened my mind, as for the (very limited) use I have of the little device, Windows 10 is actually a good alternative to Android, the two (mobile/touch) OS's - more or less - achieve the same, and led me to justify the otherwise senseless horror that Windows 10 represents.
So - somehow - I could understand the reasons behind the "continuum" experience idea, a same OS (and graphical interface) that sucks (and sucks big) on desktop and notebooks, but that somehow works on smartphones, phablets and tablets (i.e. essentially for internet activities), offering on the final users' desktops and notebooks (which in the MS guys' forecasts were deemed to represent a marginal amount of devices, outnumbered by small. portable, touch devices) the same experience.
It had some perverted logic, but now that the greatest number of these devices (the smartphones) are not a target anymore, the rest (phablets and tablets) should be not anymore enough in number to justify specific development.
A number of them had Windows only because the good MS guys made licenses free for devices with a screen smaller than 9' :
More generally, it seems to me that all the hype about tablets and touch has toned down a little, possibly the only device that possibly has a future is the (not-so-cheap) Surface (which more or less is a good competitor to the iPads) or similar devices (i.e. "large" tablets that can work - to a certain degree - as laptop replacement).
At least I have noticed looking around myself in airports and similar places an increase in the number of conventional notebooks/laptops and a decrease of tablets, these latter plainly replaced by (largish) smartphones.
About Windows previous diffusion on mobiles, actual data:
Shows that Q1/2009 MS had 10.1% BUT rather than "less than 1%" nowadays it has "N/A" erwan.l -1 Whateverishisnametoday +1
Last point in the graph is Q4 2016 when it had 0.3%, since Q1 2017 it is bundled in the "Other" that make 0.2%
Here is another source, only 2016/2017 that confirms the utter irrelevance of the OS since Q1 2017:
The above are market share (i.e. new shipments/sales), Statcounter has some more recent data on usage (understandably with a slightly higher set of values) January 2017 1.14% January 2018 0.61%.
No, MS NEVER was a market leader, before the iPhone there was Symbian (NOT Rim/Blackberry):