Two decades ago this week, the first version of Mac OS X hit shelves. We're not talking figuratively. The software was sold direct to consumers on disk, with a suggested retail price of $129 (roughly $190 today, adjusted for inflation).

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Back in 2001, Mac OS X 10.00 Cheetah was a rough-around-the-edges break from the ageing Classic Mac OS, which had much of its origins in the original Macintosh’s System 1 software. In the years since, the platform has undergone two architecture shifts (PowerPC to Intel, and now Arm) and matured to the point where it commands nearly 10 per cent of desktop market share globally.

Getting there, however, wasn’t easy.

From big problems to big cats

The story of Mac OS X didn’t start in 2001, but rather in 1985, when Steve Jobs was ousted from Apple following a failed boardroom coup, and multiple product flops. The Apple Lisa project was a dismal failure, selling just 10,000 units. The Macintosh, although infinitely more successful by comparison, failed to slow the ascent of IBM in the PC market, and didn’t meet the company’s lofty sales goals.

Although Jobs was no longer part of Apple, he remained involved in the computer industry, later founding NeXT Inc, which aimed to build workstation-class machines for the higher education market. Its first computer, revealed in 1988, was a powerful (albeit excruciatingly expensive) cube of black aluminium based on a 25MHz Motorola 68030 CPU and 68882 FPU, with 8MB RAM and an optional 330MB or 660MB hard disk. It came with a bespoke UNIX-based operating system called NeXTSTEP that was founded on the Mach and BSD kernels, with object oriented programming principles throughout.

It was revolutionary, but that wasn’t enough to overcome its steep $6,500 ($14,500 in today’s money) asking price. Universities didn’t bite – although the hardware was used to develop the first web browser and server, as well as id Software’s Doom and Quake. By 1993, NeXT had left the hardware business to focus on porting NeXTSTEP to IBM-compatible PC, as well as PA-RISC, SPARC, and the Motorola 68k architectures.

Apple had its own problems, too. The Macintosh was stagnating. Windows 95 – which combined the previously separate DOS and Windows software – proved to be a roaring success, helping Microsoft expand its market share. When it arrived in 1995, Windows 95 was highly usable for first-time computer owners, and had features Mac OS 7 simply lacked, like preemptive multitasking. Separately, a disastrous decision by then-CEO Michael Spindler to license Mac OS 7 to third-party manufacturers resulted in the company’s high-margin hardware sales shrinking further.

The Next Step

By 1997, Apple was mere weeks away from bankruptcy. As a Hail Mary, CEO Gil Amelio (who replaced Spindler in 1996) acquired NeXT, bringing Jobs back to the company he founded from a Los Altos garage. While Jobs (who would assume the top role the following year) would ultimately nurse the company back to health, Apple was most interested in the NeXTSTEP operating system.

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You see, Mac OS was, at the time, stagnant. Whereas Windows had made leaps and bounds in terms of things like peripheral support and the internet, Apple had yet to implement basic system-level features like pre-emptive multitasking, multithreading, and protected memory. During the Amelio years, Apple had attempted to create a new operating system on a clean-sheet kernel called Nukernel, but it died in the fiery pits of development hell.

With Jobs at the helm, work started on a new operating system based on NeXTSTEP. The old Mac OS 9 nanokernel was replaced with Darwin, itself a direct descendant of the NeXTSTEP kernel. Other NeXT features - like the use of object-oriented programming, the Objective-C language, and the Dock - also made an appearance. It was a clean break with the past, with a brand new interface dubbed Aqua, and APIs that would allow developers to port their existing software.

The full release version of Mac OS X 10.0's UI (click to enlarge)

This, ultimately, became Mac OS X 10.00 Cheetah. And while its legacy continues to this day, the initial launch was somewhat underwhelming. It lacked feature parity with Mac OS 9, with DVD playback and CD burning unavailable at launch. Despite the release of a public beta, many developers (including Microsoft and Adobe) hadn’t updated their software to use the Aqua APIs. And it was dog slow, particularly when running applications using the backwards-compatible Classic APIs.

Worse, while many had hoped the Unix foundations and protected memory of Mac OS X would improve stability when compared to its predecessors, the software was rife with fatal bugs, which frequently presented themselves when using external peripherals.

The road since travelled

Teething problems with Mac OS X Cheetah didn’t stop Apple’s upward trajectory, and many of these issues were resolved in later releases. The next release, Mac OS X 10.1 Puma focused on performance improvements and improving feature parity with the Classic Mac OS, and was offered as a free update to existing users.

The next major update came in 2002. Mac OS X 10.2 Jaguar fixed the long-standing issues with printer support through the release of CUPS – the Common Unix Printing System – which was subsequently open-sourced and is now widely used across the Linux sphere. By that point, Apple was so confident in Mac OS X, Jobs performed a mock funeral for the Classic Mac OS X on stage at the company’s Worldwide Developers Conference.

At the time, Mac OS X was exclusively available for the PowerPC platform. By the decade’s halfway point, it was struggling to compete with chips from Intel in key metrics like power consumption. IBM, which built PowerPC chips on behalf of Apple, was manufacturing on larger nodes than those used by Intel, which was already transitioning to 65nm. Whereas it once enjoyed a competitive edge in processing power, Apple was faced with the prospect of losing that advantage.

And so, in 2005, Apple announced the transition to Intel, starting with Mac OS X 10.4.4 Tiger. This had been on the cards for some time. For each version of Mac OS X released, Apple had secretly created an x86 port, so there wasn’t much re-architecting required internally.

Apple had flirted with a move to Intel in the past. Rhapsody OS, which later became Mac OS X Server 1.0, was released for both PowerPC and x86, with versions for IBM RISC System/6000 and DEC Alpha architectures considered. Additionally, the foundational basis of Mac OS X, NeXTSTEP, was also available for Intel processors. This preparation and experience allowed Apple to recognise the writing on the wall and pivot.

As transitions go, the shift to Intel was as painless as could be, especially compared to the jarring leap from Mac OS Classic to Mac OS X. Legacy apps were able to run via the Rosetta compatibility mode (which was later discontinued in 2012). Developers could target both PowerPC and Intel platforms with universal binaries. And Apple offered developers a rental “transition kit” ahead of the public launch, giving them a head start.

In retrospect, this experience informed Apple’s next platform shift, with the company moving from Intel to its own Arm-based Apple Silicon processors in 2020. It has used the same playbook, down to the developer tools and pre-release transition hardware.

Plus ça change

In the two decades since the launch of Mac OS X, a few things have changed. Objective-C is declining in popularity, with Apple’s syntactically nicer Swift programming language gathering pace. The name changed a few times too, with Apple re-branding the system OS X in 2012, and finally macOS with the launch of version 10.12 Sierra. We’ve seen the launch of the Metal graphics API, which provided better rendering performance for games and other visually-intensive apps, as well as the inclusion of iOS and iPadOS features, like Siri.

Apple: We'll tailor Swift to be a fast new programming language

But the foundations first introduced in 2001 are still there, from the UNIX underpinnings to the NeXTSTEP Dock. While Windows has undergone multiple UI changes, macOS has largely remained mutually intelligible with its predecessors. As a collector of retro Apple kit (your correspondent has around 30 machines, ranging from a Mac OS 7-era Performa, to various post-Jobs PowerBooks and iBooks), it’s amazing to see how little has changed. I can use an iBook G4 running Mac OS X 10.3 Jaguar and feel just at home as I would with a latest generation M1 MacBook Air.

Mac Os Versions

And that is the story of Mac OS X. It didn't seem like it would make it, but getting the fundamentals right – dare we say it even more than the cult of Steve Jobs – matters. ®

Back up your library

Before following any of these steps, it's a good idea to create a backup of your photo library, even if you use iCloud Photos. You can use Time Machine, use a third-party backup solution, or copy the library to an external drive. By default, your photo library is stored in the Pictures folder within your home folder.

Make sure that your software is up to date

Photos is part of the Mac operating system. You can avoid or fix many issues by running the most up-to-date version of macOS. Learn more about updating the software on your Mac.

If you use RAW images in Photos, learn more about the digital camera RAW formats supported by iOS, iPadOS, and macOS.

Air Attack Mac Os X

If you have trouble migrating an existing iPhoto or Aperture library to Photos

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You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. Learn what to do if Photos can’t copy or create a library.

If the Media Browser isn't showing your photos and videos

Use the Media Browser to make images from your photo library available in other apps, like Pages and iMovie. The Media Browser shows only the contents of the Photos library designated as the System Photo Library. If you have more than one Photos library—and the one you're using isn't set as the System Photo Library—the Media Browser won't show its contents.

Follow these steps to designate the current library as the System Photo Library:

1. Choose Photos > Preferences.
2. Click the General button at the top of the Preferences window.
3. Click Use as System Photo Library.

If you're having other issues with Photos

If you're experiencing other issues—like missing or blank photo thumbnails, unexpected behavior, or if Photos won’t open—try to see if it's an issue with your library by following these steps.

Create a new Photos library and see if your issues persist:

1. Quit Photos.
2. Press and hold the Option key while you open Photos.
3. In the dialog that appears, click Create New.
4. Give your new library a name, then click OK. Note whether Photos opens successfully with this new library.

To return to your main Photos library, quit Photos. Then open it again while holding the Option key, select your main library, and click Choose Library.

Alternatively, you can open Photos in another user account on your Mac and note whether Photos opens successfully.

If Photos opens with the new library, or in a different user account, it might mean that there's an issue with your library. Follow the steps to use the Photos library repair tool on your main Photos library.

Learn more

• Learn how to create and order print products like books or calendars in Photos with Project Extensions.
• Get help with iCloud Photos.