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Mac OS X 10.9 Mavericks is a free upgrade to all

The next iteration of Apple's operating system, Mac OS X 10.9 Mavericks, was announced originally at the WWDC in June, but at today's Apple event we found out it's available today for free.

Now playing: Watch this: Apple releases free OS X Mavericks

At the Apple event today, we finally learned that Mac OS X 10.9 Mavericks is available today. I already went over the new Finder tabs, iBooks for Macs, Finder tags, and improved full-screen apps in my hands-on for Mavericks in June, but Apple gave us a recap to talk about what the OS does beyond the new features.

Along with new features, Apple says part of the idea behind Mavericks is to get the most out of your hardware, and Apple says improvements to energy management get you as much as an hour more for Web browsing, simply by installing the new OS. It also has improved graphics, and better processing power to make the whole OS more efficient.

The big news today is that Apple has changed its OS pricing. Mavericks is free even if you're using older versions of the OS as far back as Snow Leopard, which was released in 2007.

Editors' note: I'll be updating this story throughout the day as I get more information about Mavericks.

This is a developing story. Follow our CNET live blog and see all of today's Apple news.