It was March 24th 2001 when Steve Jobs introduced the amazing Mac OS 10.0.0 Cheetah. It has just turned 10 and Mac has come a long way now. And definitely innovative than it’s competitors.
You can view some more information on how Mac has evolved as a great OS at it’s Wiki Page.
Here’s the video of Steve Jobs introducing Mac OS X 10.0.0 in 2001 at Macworld.