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Project Aion: Microsoft’s Hidden AI-First Windows Prototype
No Start menu. No desktop icons. Just Copilot, everywhere, as the central component. An internal Microsoft video has leaked, and it shows Project Aion, an experimental Microsoft operating system where AI is not added to Windows: it becomes Windows. Here’s what we know about this OS that may never see the light of day.
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A homegrown agentic OS
The starting point for this rumor about Project Aion? An approximately three-minute video, dropped on the BetaWiki Discord server before spreading across the Web. According to Windows Central, two internal Microsoft sources would have confirmed the demo’s authenticity.
Codename: Aion. Behind this name lies an example of an agent-based, web-based operating system that natively integrates Copilot at the heart of the interface. This is not a theme or a cosmetic overlay. Where Microsoft’s AI assistant first appeared in Windows as a button, Aion makes it the system’s main element: everything revolves around Copilot.
Copilot Start, Omnibox, Spaces: an agent-driven desktop
Copilot Start replaces the traditional Start menu, becoming an AI-powered menu that would take over the historical button. That would be yet another transformation for the Start menu. Here, Copilot Start becomes a single entry point: it would aggregate the user’s Microsoft 365 feed, favorite tools, websites and PWA apps, contextual suggestions, and past conversations.
What stands out from the Aion demonstration:
- A multimodal Omnibox. This single input bar would be used to browse the web, launch a tool, or chat, with autocomplete and autosuggestions. Behind the scenes, a local orchestrator would route the request to the consumer or enterprise version of Copilot depending on the context. And by typing a
/, users would trigger Context IQ to pull directly from their Microsoft 365 data. - Windows that materialize on the fly. Actions launched from Copilot Start would detach into standalone windows on the desktop and taskbar, each with an AI-generated icon, enabling multitasking without leaving the agent.
- Spaces, for goal-oriented work. Instead of organizing by application, Aion would structure work into spaces that represent your goals. These Spaces would rely on a motor called Silverstone. And since everything runs through Edge, the system could analyze each site’s DOM to understand its full context. These spaces would be saved automatically: close one with a gesture, reopen it later, and pick up right where you left off.
- Win32 offloaded via Windows 365 Handoff. Since Aion is 100% web-based, it still needs a bridge to real desktop software. When the system detects that a visited site has a Win32 app available in Windows 365, Microsoft’s cloud PC, a handoff button would open the app remotely, with your content already loaded.
- Interactive plugins in the conversation. Need to send a summary to a colleague? Just ask: an interactive email control is generated, pre-fills a draft from the space’s context, and the message is sent with a tap.
A 2024 prototype: Microsoft confirms nothing
Let’s slow down for a moment. Still according to Windows Central, the video would be old (reportedly from sometime in 2024), and nothing indicates that Aion ever moved beyond the lab stage. At this time, Microsoft has not officially mentioned Aion: it may never be released. Microsoft could also use it to experiment and then feed those ideas back into Windows.
This kind of work is not surprising, since we know Microsoft is working on the concept of an agentic OS. On the other hand, we also know that Microsoft is moving cautiously when it comes to integrating Copilot into Windows: is this to better prepare for Aion’s arrival? Or not.
