I stand corrected and humbly defer to your knowledge of horrible browsers ;)
Not IE 6. Mac stopped at 5.something.
Yup, but I remember IE 5.2 on Mac being a little better wrt. the w3c standards than IE 6 on windows, so I guess the version numbers weren't really comparable.
It was better in some ways, but IIRC the box model was the brokenest thing ever.
Don't worry! It's an industry-wide standard (apparently).