On October 16, Apple released OS X Yosemite which is version 10.10. I have been beta testing since the first developer release and also testing with iOS 8. Here is everything that I learned and how I've sized up this stellar OS X release.
OS X Yosemite 10.10 is the latest version of Apple's Macintosh operating system. It has descended from a long, distinguished line of Apple OSes that started with a public beta in September of 2000 and then the release of Mac OS X Cheetah 10.0 in March of 2001. Apple has dropped the "Mac" prefix and generally doesn't refer to version numbers anymore. That's why the new release is just called OS X Yosemite.
For a time, we all wondered what would happen after OS X Mavericks 10.9 because that's the end of the 10s. But long ago, Apple let on that it has no problem with versions 10.10 and 10.11 and so on. So much for changing from OS X to OS XI. "Ten" is the thing, and that's where we'll stay. Even Microsoft likes the sound of "ten" with the dramatic jump from WIndows 8 to Windows 10.
As usual, you'll want to make sure you have a Time Machine back-up of your boot drive before you install Yosemite. For a list of Macs that will run this new OS, see Jeff Gamet's "List of Macs That Will Run Yosemite." When you're ready to upgrade, you'll find Yosemite in Apple Menu -> App Store... Yosemite is free.
The goal of this review is to provide a guided tour of my experiences with OS X Yosemite. It's not a detailed instruction manual. Rather, it's intended to help you size up this new OS from Apple and make an early or deferred decision to upgrade.
Next - Why Should You Upgrade?