A recently leaked video has offered a fascinating glimpse into Microsoft's exploration of a dedicated AI operating system, codenamed "Aion." This ambitious project, reportedly built around web technologies, places Microsoft Edge and a new lightweight Windows codebase called Win3 at its foundation, with Copilot serving as the absolute core of the user experience.
The three-minute video, which sources confirm to be authentic though showcasing early working code, first surfaced on the Discord server BetaWiki. It provides a comprehensive walkthrough of what appears to be a real, albeit nascent, desktop user interface. Key elements include a familiar-looking Taskbar at the bottom, a Start menu-like interface deeply integrated with Copilot, and other innovative features.
According to the video's narrator, "Aion is an example of a web-based agent OS that natively builds Copilot into the core of the shell." The entire interaction model revolves around Copilot and a multi-modal input box, functioning as the primary hub for users to locate files, launch applications, and browse the internet seamlessly.
A standout feature highlighted is "Spaces" on the Taskbar. This unique functionality automatically groups related applications and websites into distinct buckets, allowing users to effortlessly return to specific workflows later. These "Spaces" also appear within the Start menu, streamlining the process of opening multiple items with a single click.
Crucially, Aion's design emphasizes its web-centric nature, meaning it doesn't natively support traditional Windows applications. Instead, it exclusively runs web apps and websites. For users requiring access to conventional desktop applications, Aion leverages Windows 365 to stream them from a Cloud PC. However, the video does briefly mention an alternative version of Aion that runs atop Windows 11, which would presumably enable native Windows app compatibility. The version showcased in the leak, however, is based on the Win3 codebase—a streamlined version of Windows that sacrifices support for legacy Win32 applications in favor of accelerated updates, enhanced battery longevity, and superior security.
Sources indicate that this video is somewhat dated, having been recorded sometime in 2024. Its origins are unclear, with speculation ranging from a simple Hackathon project to a more significant internal initiative. Aion was fundamentally an experimental endeavor, conceived to explore the full potential of a desktop user experience built from the ground up around an agentic AI. Consequently, it remains uncertain whether Microsoft has any plans to release Aion to the public.
Despite its experimental status, it would be surprising if the valuable insights gleaned from the Aion project aren't already influencing the development of current Windows versions. While Aion, as depicted in the video, might not see a public release, agentic OS capabilities are progressively being integrated into Windows 11. Furthermore, Microsoft recently unveiled Project Solara, another agentic OS experience designed to generate just-in-time UIs based on user requests, which runs on both AOSP and Windows—mirroring Aion's flexibility. This raises the intriguing possibility that Aion may have evolved into Solara.
Regardless of its ultimate fate, this leaked footage offers a fascinating window into one team's vision for the future of desktop computing, with Copilot at its very heart. Given the significant user backlash surrounding Copilot over the past year or two, it wouldn't be surprising if Microsoft is currently re-evaluating many aspects of these AI-first strategies. Microsoft declined to comment when contacted for this story.
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