Apple has announced that OS X Yosemite, the latest major release of the world’s most advanced desktop operating system, is now available as a free upgrade for Mac users from the Mac App Store. Yosemite delivers a fresh, modern look and introduces Continuity features that make it easy to hand off activities between Mac and iOS devices and even make and receive iPhone calls from your Mac. Yosemite also includes a new Today view, a redesigned Spotlight, and updated versions of Safari, Mail, Messages, and iTunes. “OS X Yosemite is the most advanced version of OS X we’ve ever built, with a brand new design, amazing Continuity features, and powerful versions of the apps you use every day,” said Craig Federighi, Apple’s senior vice president of Software Engineering. “OS X Yosemite ushers in the future of computing, where your Apple devices all work together seamlessly and magically. It’s something only Apple can do, and it’s available today.”