I'm curious, what is everyone's favorite version of Mac OS? Mine is Mac OS 9.x.x and Mac OS 10.3.x. What about you guys? I liked Mac OS 9 because it kept the beautiful new "Platinum" environment from Mac OS 8 while really expanding on internet connectivity. They made Mac OS 9 to be as compatible with the internet as ever, even being called "The best OS for Online". I love Panther pretty much for one reason. The intro video. That was the best intro video Apple ever made.