Mac OS X included the Classic Environment, an emulator that allowed users to run programs coded for MacOS 9, enabling a (not always) smooth transition to the new operating system. Compared to 10.0, it added DVD playback and a number of performance enhancements, but Apple was working on simply shipping an operating system that worked, and that contained the features required to get users to transition form MacOS 9, at that point. OS X 10.1 really didn’t have many new features the entire operating system was, for most people, new.

Mac OS X was still optional at this point, and those with older Macs were better off avoiding it, but in January, 2002, Apple announced that OS X would become the default operating system for all future Macs. But when 10.1 Puma was released in September, 2001, OS X started its long march toward the future. They were only for early adopters and developers, and average users didn’t pay much attention to them, in part because they were quite incomplete. The first two-the public beta and 10.0 Cheetah-didn’t attract much attention. While we’re currently at OS X 10.11, there have actually been 13 versions of this operating system (originally called Mac OS X). I’ll skip all the security features, which are covered in the previous article.

Below, we will take a look back at the many key features that have been added to OS X over the years. We’ve recently published a timeline of the many security features added to OS X-it’s fascinating to see when privacy features that we take for granted were added to the operating system. Features such as tabs in the Finder and in Safari, security features such as File Vault, apps like Face Time all these were launched with a big fanfare and have settled into their place as stalwarts of OS X. If you use a Mac, you take for granted a number of features that, when they were first added to the OS X, were pretty big deals. Apple + Recommended + Software & Apps Timeline of Key Features Added to Every Mac OS X Release to Date

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