Chrome OS saw a good raise too. OS X(Mac) saw a decrease.
What’s with the big spike in “unknown” at the same time as Windows market share going down a bunch?
I don’t know, buf I remember seeing all of that change had originated from India. So something happened there, I think
I heard rumors that the Indian government switched to some specific Unix like that has accounted for a lot of that, but I have zero experience on the matter aside from someone saying that could be it.