Petreley says: "There is one additional factor that cannot be overstated. To anyone who truly knows what free software means, they know that "free" as in liberty is the greatest strength of Linux. However, one cannot deny the power of "free" as in "free beer." Microsoft applied this power to make Internet Explorer the most popular browser in the world. Of the three top competitors on the desktop, Windows, Mac OS-X, and Linux, only one of them is free as in beer. That will go along way toward making it the de-facto standard on the desktop.