Microsoft was planning to build a lightweight, browser-based OS around Copilot

A leaked video is giving us a look at an experimental Windows concept that ditches almost everything familiar about the desktop in favor of Copilot. According to Windows Central, which says its sources confirm the footage is real, the project is codenamed "Aion" and appears to date back to 2024.

The roughly three-minute clip leaked on the Discord server BetaWiki and shows a desktop built on Win3, a stripped-down Windows codebase that runs largely through Microsoft Edge. There's still a taskbar and a Start menu-like launcher, but the whole thing revolves around a multi-modal Copilot input box instead of icons and folders. Ask it to find a file, open an app, or check your schedule, and Copilot handles it. A feature called "Spaces" automatically groups related apps and sites so you can jump back into a task with one click.

Since Aion is web-based, it reportedly can't run traditional Win32 apps natively. Instead, heavier desktop software would stream in through a Windows 365 Cloud PC. Microsoft declined to comment when Windows Central reached out, and it's unclear if this ever moved past an internal concept or hackathon project. From the video examples, however, it does look like the project got fairly deep into development.

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We've closely watched this pattern play out for a while now. Microsoft has gone back and forth on how aggressively to push Copilot into Windows, from bringing Copilot to Windows 10 as a surprise U-turn, to quietly shipping a "native" Copilot app that turned out to just be a website, to more recently reevaluating its whole Windows 11 AI strategy and scaling Copilot back out of apps like Notepad.

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Yet just weeks ago, Copilot returned as a sidebar users can dock to their screen, and the current Copilot app is still basically Edge wearing a costume. Microsoft is apparently unable to make a firm decision on whether Copilot has a place in Windows 11. If they were to ask users, the answer would be a firm "no," but they also have their own interests to further. Project Aion looks like the most extreme version of that same instinct, just one that Microsoft apparently wasn't ready to ship.

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As for whether something like this could actually work, dropping Win32 support is a massive trade-off. It would mean no Photoshop, no legacy business tools, none of the software people have relied on for decades, unless you're constantly streaming a cloud PC. Given how much pushback Copilot already gets in its current, much smaller footprint, a full OS built around it would probably be a tough sell today. It's easy to see why this stayed a prototype.