I say 1st commercial OS. RT @BenBajarin: @asymco @cdhowe true but perhaps this is now the first mass market consumer OS doing so?

On to MacBook Pros now. Note that the new compressed memory will make a big difference on soldered in RAM MacBooks. #ygmd

Mavericks runs on Macs going back to 2007 and is available to everyone today from the Mac App Store. #ygmd

The market price for computer operating systems is now pinned at zero. #ygmd

Mac OS X Mavericks is now free. #ygmd

The new focus on power efficiency in OS X aligns with my latest report, “Batteries: The Power of Mobility.” tinyurl.com/ljosajb #ygmd

Craig Federighi is now hosting the Apple “Tuesday Morning Live” comedy show. The man has a gift for adding humor to a demo. #ygmd

Native Apple Maps on OS X that syncs with your iPhone and iPad. I’m thrilled about that. #ygmd

New Safari feature: links on your Twitter and Facebook account show up automatically in a sidebar. #ygmd

More focus on integrated graphics rather than discrete in new Mac OS X roadmap. #ygmd