Microsoft is not going to backport the new version of Internet Explorer from Windows XP SP2 to previous versions of Windows, so if you want a “secure” browser, you have to cough up the cash to upgrade your operating system. The article points out that 200 million people are using older versions of Windows. On one hand, people who don’t want to pay to upgrade their OS to get a better browser seem like perfect candidates to use Firefox. On the other hand, are people who don’t bother to upgrade their OS going to find and download a new Web browser? It seems unlikely to me.