Apple today launched OS X 10.10, aka Yosemite, as a free upgrade for most Mac owners.

Mac users running last year’s Mavericks, 2012’s Mountain Lion, 2011’s Lion and even 2009’s Snow Leopard are able to download Yosemite from the Mac App Store starting today. The no-older-than-Snow-Leopard limitation was due to the App Store, the only distribution channel for Yosemite; versions of OS X that preceded Snow Leopard cannot access the online mart.

During a news conference today — which Apple live-streamed — Craig Federighi, who leads iOS and OS X development and has taken the roll of Jerry Lewis to Cook’s Dean Martin straight man, spent considerable time summarizing the new features of Yosemite.

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