i would also point out that, for many, many people windows is perfectly adequate. these are people who don't care about the details/features of various browsers. these are people who really don't want to spend a lot of time on a computer -- and there's absolutely nothing wrong with that, nor is there anything wrong with not caring about whether opera, firefox, or ie work best. consider as well that if you use a non-ie browser, a firewall, anti-virus software, and spyware software your web experience is certainly not so problematic that you would feel the need to switch to a mac. i won't list all the reasons/changes that apple might need to make to increase its computer market share; but no matter how much people say osx is so superior to windows, one must accept that most of this superiority is lost on people who, again, see the computer as a commodity. they, rightfully, want it work without complication ... and before one argues that the mac is simpler to operate, i would argue that it's not simpler if what you KNOW is how to operate windows.
Firefox Sets The Bar For Mac Adoption