OS X Mavericks is on the board at today’s presentation, as expected they have detailed some of the new features of the OS, but slightly less expected was the announcement that the software will be free and available from today.

The new update will add a number of features that have already been explained may times before, probably the biggest of all of them is the new battery life and performance optimisations that allow your computer to run longer and better, without upgrading hardware.

For an example, Apple said that the update will add an extra hour of web surfing to the battery life of the MacBook Air that was launched earlier this year.

Mavericks will also add the new iBooks and Maps applications as well as improving upon the calendar app, multiple display functionality, adding tags to the finder and providing better notifications.

Owners running Snow Leopard, Lion, or Mountain Lion on a MacBook released after 2007 will be able to download the update for free from the Mac App Store today.

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