Let me consult today's LA Times Classified section to see how many job opportunities there are requesting people who know Mac OS X...
Right. 21% of the companies reported knowing about someone who was running Mac OS X; a very rare beast outside of the marketing departments in almost every corporation in America.
That's the point. Unlike Windows, an enterprise doesn't need a large staff of technicians to maintain Mac OS X. It's easier to install, it doesn't constantly break down or get infected with worms, viruses and spyware, etc.
Why must you misrepresent what the article said... it did not say that "21% of the companies reported knowing about someone who was running Mac OS X". It stated flatly that
"In Businesses that had 10,000 or more employees, 21 percent of
employees used Mac OS X on their desktop work computer.