Microsoft’s new Windows on Arm push is a milestone moment. It’s taken nearly five years to get to the point where the software maker is confident it has the upper hand over the MacBook Air on performance, battery life, and app compatibility.

But behind the scenes, Microsoft has been working on something even bigger. While Microsoft has spent years working toward an Arm transition that will now play out throughout the summer and beyond, it’s the AI overhaul at the heart of this new generation of “Copilot Plus PCs” that could fundamentally change how we use Windows on a daily basis.

I recently got the chance to hear from the leaders behind Microsoft’s big AI push, and they made it clear that this isn’t just a silicon change. Microsoft has rearchitected Windows 11 to run dozens of AI models in the background, and they believe it can reshape the experience of using a PC.