Project Aion leak: Microsoft’s Copilot desktop concept

A leaked video has surfaced showing Microsoft’s internal exploration of a dedicated AI operating system codenamed Aion, built on a stripped-back Windows codebase called Win3 and centred entirely on Copilot. The roughly three-minute clip, as reported by Windows Central, first leaked on the Discord server BetaWiki and shows what looks like early working code for a new desktop interface. It’s experimental, reportedly recorded sometime in 2024, and Microsoft has not confirmed it exists — but it’s a rare look at how the company has been thinking about the desktop.

Senior Editor Zac Bowden, who broke the story, says his sources confirm the video is real. It walks through a familiar-looking desktop — a Taskbar along the bottom, a Start menu-style interface — except every part of it is wrapped around Microsoft Copilot instead of the app icons and windows we’ve spent 30 years learning.

What Project Aion actually is

Aion is an experimental web-based agent OS that places Copilot at the core of the shell, built on Microsoft Edge rather than the traditional Windows desktop. The video’s narrator sums it up plainly:

Aion is an example of a web-based agent OS that natively builds Copilot into the core of the shell.

In practice, that means the whole experience revolves around a multi-modal input box. Instead of hunting through folders or a Start menu, you type or feed it what you want — files, apps, the web — and Copilot handles the navigation. It’s the OS as a chat prompt, with the desktop furniture arranged around it.

What Win3 is and what it gives up

Win3 is a lightweight version of the Windows codebase that drops support for legacy Win32 apps in exchange for faster updates, longer battery life, and better security. That is the whole trade, and it’s a big one. Win32 is the decades-deep library of traditional Windows software — Photoshop, older business tools, half the things a UAE office runs on. Aion’s Win3 version simply won’t run them natively.

The thing is, Microsoft has clearly decided that weight is worth shedding. A codebase that doesn’t have to carry three decades of backwards compatibility can update faster and sip less battery. Whether users are ready to give up their existing software for that is the question the project doesn’t answer.

How you’d run normal Windows apps

The Win3 version of Aion doesn’t run native desktop apps at all — it only runs web apps and websites, and leans on Windows 365 to remote into a Cloud PC and stream a desktop app when you need one. So your legacy software still exists; it just lives on a machine in a data centre that you connect to over the internet.

That works cleanly on a fast, stable connection and less cleanly on anything else. For a region like the UAE, where cloud infrastructure is solid but a streamed desktop is still a streamed desktop, the reliance on remoting is worth noting.

The Spaces feature on the Taskbar

Spaces is a Taskbar feature that automatically groups your apps and websites into a bucket you can return to in one click. Those groups also show up in the Start menu-style interface, so you can reopen a whole set of related apps and sites at once rather than launching them one by one.

It’s a sensible idea — the kind of thing that could land in mainstream Windows without anyone needing to rebuild the OS around Copilot to get it.

How the two versions of Aion compare

There are two versions in play. The one in the leaked video is the Win3 build; the video also mentions a version of Aion that runs on top of Windows 11, which would presumably keep native app support intact.

Feature	Aion (Win3 version)	Aion (Windows 11 version)
Base codebase	Win3 (lightweight)	Windows 11
Win32 app support	No	Presumably yes
Web app support	Yes	Yes
Desktop app access	Via Windows 365 Cloud PC streaming	Native
Battery life	Better (claimed)	Standard Windows 11
Update speed	Faster (claimed)	Standard Windows 11
Security	Better (claimed)	Standard Windows 11

Will Microsoft ship Aion?

It’s unclear, and Bowden is upfront about that. His sources say the video is old — recorded sometime in 2024 — and it may have been a Hackathon project instead of a formal initiative. Aion was experimental, built to explore what a desktop could look like if you designed it from scratch around agentic AI. Whether Microsoft ever intends to ship it is not known.

What is more certain is the influence. Bowden’s take:

While I don’t expect Aion to ship as depicted in the video above, agentic OS capabilities are already finding their way into Windows 11.

Zac Bowden, Senior Editor, Windows Central

He also flags the obvious headwind — Copilot has not been universally loved. As he puts it, given the sheer backlash around Copilot in the last year or two, he wouldn’t be surprised if Microsoft is already rethinking much of this. That’s a fair read: an OS that turns Copilot into the front door is a hard sell to anyone who has spent the past two years trying to move the Copilot button out of the way.