So why is Windows so popular?

Linux has been around for ages. However, it's never been (and may never be) as popular among the average punter as Windows or Mac OS are. The following entry has some sensible reasons why.

Five crucial things the Linux community doesn’t understand about the average computer user by ZDNet's Adrian Kingsley-Hughes -- Question: Why is it that the average computer user still chooses to spend hundreds of dollars on Windows or Mac when there are countless Linux alternatives that they could download, install and make use of completely free of charge?