Back in 2009, I watched a talk by the president of the national association of cybercafes. Five years ago, apparently about 70% or more of the internet access in the country was in cybercafes (it's a huge country, so there are big metropolis and big countrisides, that explains the number).
Anyway, he stated a big reason for Windows popularity here was, people would get to know windows in (pirated) copies in cybercafes, then use pirated Windows at home, then Windows would be the choice of use at work, and MS would profit from the small parcentage of legit Windows sales, because of lock-in.