It's just momentum. You buy windows because you have windows. You buy windows because there's not really much of a choice. You have windows because you're not going out of your ways to reconfigure hundreds of laptops at your company just for your employees to be less comfortable with Linux.

Now introduce a choice… and things might change.

With the vast majority of software nowadays living in the browser, your OS matters less and less, especially for a business that buys machines for its employees.