Apple previewed OS X 10.9 Mavericks the newest version of the Mac operating system during a keynote presentation at WWDC. The company finally launched the software on 22 October after an event that also saw the launch of the iPad Air, iPad mini with Retina display, and new MacBook Pros

According to Apple there are more than 200 new features in Mavericks. They gave a taste of just a few in the WWDC keynote including Maps and iBooks on the Mac, Finder Tags and Tabs, enhanced multi-display support for power users, new core technologies for breakthrough power efficiency and performance, and a new version of Safari.

In contrast, Mountain Lion was with developers in February 2012, previewed at WWDC in June 2012, and ready for launch by 25 July. At the time Apple said that it was moving to an annual release for it's operating system, and but it didn't maintain this promise as that would have indicated a July launch of OS X 10.9 Mavericks.

With developers only seeing the preview of the new Mavericks OS X on 10 June, a July launch was clearly unlikely. In fact, Apple confirmed that the final release of OS X Mavericks would come in autumn 2013.

How much does OS X 10.9 Mavericks cost?

Mountain Lion costs £13.99 and we expected the new OS X Mavericks to cost the same. However, when Apple launched it, Mavericks was free.

Mountain Lion was the ninth big cat release in just over a decade and Apple's did not want to be the "first software release to be delayed by a dearth of cats." So the company named OS X 10.9 Mavericks. The choice of name was based on "those places that inspire us here in California," and Mavericks is surfing location in California.

Download Mavericks for free from the Mac App Store.

To find out more about Mavericks, read our Mac OS X Mavericks Review. Also, find out how to Get your Mac Ready for Mavericks and we answer the question: Mac OS X Mavericks vs Mac OS X Mountain Lion: should I upgrade? 

We have also published a series of tips on how to master Safari in Mavericks, and tips for how to use Calendar in Mavericks. You can also find our Maps tips here, our Mail on a Mac tips here and you can read our iBooks on a Mac tips here. Finally, read how to use two screens at the same time in Mavericks.

Watch our top 10 features in Mavericks video.