Microsoft has indeed a problem, however only in countries whose people can afford Apple level prices, and not everyone is a G7 citizen.
Coffe shops, trains and airports in Europe? Nope, rare animal on tables.
European schools? Most countries parents buy their kids a computer, and most often it is a desktop used by the whole family, or a laptop of some kind running Windows, unless we are talking about the countries where buying Apple isn't an issue on the monthly expenses.
Popular? In Germany, the few times they get displayed on shopping mall stores, they get rountinely discounted, or bundled with something else, until finally they get rid of them.
Valve is heavily dependent on game studios producing Windows games.