Competing with Windows: Why Microsoft has a monopoly

From a column at ZDNet: “The best proof that Microsoft
is a monopoly is that
FreeBSD, Linux, and other
systems are provided to the
public at no cost with little
effect on the sale of Windows.

Before I explain this, imagine
Mercedes-Benz offering their
cars for free. They finance
this free car operation
through donations, volunteer
workers, sales of T-shirts,
and the servicing of cars.
Certainly you can understand
that other car companies
would be devastated.”