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Heh, get with the program. I kill me.
However, I do fully support most current popular browsers (IE, Netscape, Opera, and Firebird) and I recommend other webmasters do the same.
I think it is an audience issue. How many are using 4. If it is a noticable amount I would make the site work for it. You could always have a plain site for older browsers, screen readers and text browsers if you see enough visitors to justify it. I try to let the visitors stats make me go beyond IE 5+, Netscape 4+, Opera 5+, mozilla, and the other hodgepodge of open source like firebird, safari, and konquerer.
However, we are doing research on the extent employees are running more sophisticated/modern systems at home. None of our Javascript or CSS depends on the latest and greatest right now, but of course what was latest and greatest a year ago is becoming more mainstream day by day.
Your mileage may vary.
I don't support IE 4.0. There has to be a cut off somewhere. Obviously that depends on each site's visitors. For me, people using that dinosaur are around 0%. One thing I've noticed is IE 5 & 6 browsers dropped from above 90% for me down to less than 80%. Don't know if this is anomaly or Microsoft is starting to lose marketshare.