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Apple has actually revealed launch date and rate for new variation of its desktop OS, OS X Mavericks. And the huge shock is it will be free. software is available to download from the Mac App Shop, starting from today.

“Over the last couple of years, we’ve actually reengineered our development process, and [with the app shop], the way we distribute. Today, we will revolutionize prices,” stated Craig Federighi, Apple’s SVP of software engineering. “Today, we announce a new age of the Mac.’

Lion, Mountain Lion and Snow Leopard users can upgrade in one step (for free) to OS X Mavericks ( 10th major variation launch of OS). It’s available on Macs as old as 2007.

Apple’s previous OS updates had been boiling down in price – costing as little as $29 for Snow Leopard and even less recently – however Cupertino making a significant OS upgrade complimentary is still a big offer. (Specifically if your company name is Microsoft.)

The next-gen OS, which breaks from Apple’s prior convention of trying big feline names for OS updates (naming it after a browse break at Half Moon Bay, California, rather), brings a raft of enhancements, including an improved Finder, much better multimonitor support, a standalone iBooks application, and enhanced power management to OS X-powered Macs.

Apple invested a while speaking up Mavericks’ battery effectiveness, memory and graphics enhancements at its San Francisco-based event today – in addition to scuba diving into apps, maps and notices.

“We’ve actually concentrated on 3 things with mavericks: innovations to improve efficiency of your hardware, new functions, and brand-new apps,” stated Federighi.

Cupertino had previously stated Mavericks would arrive this fall.