It was two decades ago to the day—March 24, 2001—that Mac OS X first became available to users the world over. We're not always big on empty sentimentality here at Ars, but the milestone seemed worthy of a quick note.

A Windy Day Mac Os 11

The history of macOS, Apple's current Mac operating system originally named Mac OS X until 2012 and then OS X until 2016, began with the company's project to replace its 'classic' Mac OS.That system, up to and including its final release Mac OS 9, was a direct descendant of the operating system Apple had used in its Macintosh computers since their introduction in 1984. Back when Mac OS 8 was released, Apple took out a two page magazine ad to list all of its “firsts”. Problem was going through the list, fully half of them Windows had been doing since 1995. RELATED: 8 Mac System Features You Can Access in Recovery Mode. Your Mac’s Recovery Mode is a treasure trove of useful tools, and it’s the easiest way to wipe your computer and start from scratch. Shut down your Mac, turn it on while holding down Command+R. Your Mac will boot into the recovery partition.

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• Windows 10 vs Mac OS. Apple and Microsoft are always in this endless battle to provide their customers with the best operating system in the world. Although Apple is an older company, one can’t overlook the great products offered by Microsoft over the last decade. Windows 10 operating system is one of the most powerful operating systems to date.

Of course, Mac OS X (or macOS 10 as it was later known) didn't quite survive to its 20th birthday; last year's macOS Big Sur update brought the version number up to 11, ending the reign of X.

But despite its double life on x86 and ARM processors and its increasingly close ties to iOS and iPadOS, today's macOS is still very much a direct descendant of that original Mac OS X release. Mac OS X, in turn, evolved in part from Steve Jobs' NeXT operating system—which had recently been acquired by Apple—and its launch was the harbinger of the second Jobs era at Apple.

Cheetah, Mac OS X's initial release, was pretty buggy. But it introduced a number of things that are still present in the operating system today. Those included the dock, which—despite some refinements and added features—is still fundamentally the same now as it ever was, as well as the modern version of Finder. And while macOS has seen a number of UI and design tweaks that have changed over time, the footprints of Cheetah's much-hyped Aqua interface can still be found all over Big Sur.

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OS X brought many new features and technologies we now take for granted, too. For example, it enabled Apple's laptops to wake up from sleep immediately, and it introduced dynamic memory management, among other things.

Mac OS X's greatest impact in retrospect may be in the role it had in inspiring and propping up iOS, which has far surpassed macOS as Apple's most widely used operating system. And indeed, macOS lives in a very different context today than it did in 2001. It was recently bumped from the No.2 operating system spot globally by Google's Chrome OS, ending a very long run for Mac OS as the world's second-most popular desktop operating system in terms of units shipped.

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The most popular desktop operating system in 2021 is Windows, just as it was in 2001, but the most popular OS overall is Google's Android, which has dramatically larger market share in the mobile space than iOS does.

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So while Mac OS X's influence is profound, it exists today primarily as a support for iOS, which is also itself not the most popular OS in its category. Despite Apple's resounding success in the second Steve Jobs era, as well as in the recent Tim Cook era, the Mac is still a relatively niche platform—beloved by some, but skipped by much of the mainstream.

After 20 years, a lot has changed, but a whole lot has stayed the same.