Linux and chocolate
It's the tenth anniversary of my first ever linux install today. For the first few years I was just running it on my home PC but for the last 5 or more as my main work desktop as well. And it was already a fully-fledged unix with X windows (which macs now have), pre-emptive multitasking and multiprocessor support (which MS now have) 10 years ago, so don't let anyone tell you there's anything recent about linux as a desktop OS.
I know the date because it's my birthday, and that year I took the day off to take delivery of my first IBM-compatible PC, factory-fresh with no OS installed. This year I'm at work so anyone passing by my cubicle, please do help yourself to the cookies. There's ginger and chocolate, or double chocolate. Chocolate is compulsory you see.