I just inherited an early 12" ibook ( dual usb, G3, 500MHz, 500mb memory) and I wonder what is the highest operating system it can run? It has 10.0.4 which isn't very satisfying. It looks like I need at least 10.1 to use a decent browser, but as this is my first Mac I'm really pretty clueless as to what operating system line I need to cross to make the machine more usable. Thanks.