By request, here is when Steve Jobs introduced Mac OS X for the first time ever. I edited the video myself to show the very best moments of the presentation ...
Why Mac OS X is Better than Microsoft Windows
Mac OS X Yosemite Preview
Using Mac OS X for the First Time
CNET News - Apple announces OS X Yosemite for Mac
Обзор Mac OS X 10.10 Yosemite
Windows User's Guide To Mac OS X Leopard
Yosemite Mac OSX Beta 4 Review! (Español)
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