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Just keep showing W3C stats to your boss if you want to convince him on this matter. Still it looks like the visitors of your site are on your bosses side :-)
Or it could be that the functionallity of your site presses users to use ie (if the site does not work well with FF, Opera and others) You can use this argument if this is the case.
Good luck.
I need to stop my boss using IE!
I think some folks are just against free things. They wonder how can something that's given away be as good as that which Microsoft spent millions developing for a profit. They may even associate the term "Free" with sales gimmicks. If they can't be objective and consider the quality of the offerings then you are lost.
But the latter may be something that will be near impossible to achieve.
"It's not broke, so it doesn't need to be fix"
I'm afraid he sits firmly in this camp :( As for the idea that if you have a firewall / antivirus running then you dont need to bother switching browsers, I have to disagree- Surely the only way to move away from the nightmares of HTML soup, proprietary plugins and CSS hacks is to use a browser that follows web standards? IE might be getting better (IE7 is supposed to address a lot of current issues) but FF IMHO is by far a better and safer browsing experience.
This is starting to sound like the conversations I have with my boss....