Looking at some web stats for our company's website, I see the most popular UA (user agent) is... "Microsoft Internet Exploder"?? I'm no great fan of Microsoft's browser, but even I haven't called it that for a while... puts me in mind of Bud Uglly's brilliant Alvin's Internot Exploder - if you're not familiar with Bud Uglly, check 'em out. When I used to work in web development, this site would make me laugh until I was almost sick.
Anyhow, I did a bit of digging, and found our webalizer.conf - it's from 2000. I think our site has been hosted there for a while!