I have a Mac, so I have to use emulators or wine wrappers to test IE. I suck at x-browser compatible let alone old-browser compatible. I really want to write for old browsers though, because I have a feeling that a lot of people, maybe in the office or library still use Windows XP, maybe constantly formatting and reinstalling Windows, like when I was a PC, they may be on IE6 or something as default from CD. I can make everything work in Firefox Mac's latest version and that is about it. Is there anything close to IE6 IE7 or anything like that, maybe with an error console to speed things up, like maybe an old version of Firefox or addon or something? It seems to me, that there should be an agreement with the Mac OS now that it is Intel, but the emulated versions are too buggy for me.
EDIT: I have IE5 Mac, but it too is emulated as it is a PPC app.
1% of the market who have brand new computers perhaps, but I refuse to believe these numbers on a much more realistic world market. The website you posted isn't even x-browser compatible. http://i45.tinypic.com/zly8hg.png