Windows 10: A closer look at Cortana integration with Spartan (with video)
Microsoft's new browser has a unique feature built in... Cortana — Microsoft announced back in January that Windows 10 would ship with two browsers, the regular IE11 for backwards compatibility, and Spartan.
Context & Ripple Effects
Spartan began as a rumor in late December, when reports described a lightweight new browser codenamed Spartan being built alongside IE11 for Windows 10. By January, sources confirmed Cortana integration and stylus annotation as its differentiators, and screenshots of the new UI followed days later.
This video walkthrough from WinBeta shows those leaked features running in practice, arriving just before Microsoft's late-March decision that Spartan would carry a new rendering engine while IE11 keeps Trident — meaning Cortana is baked into the browser that represents Microsoft's forward path, not the compatibility holdover.
First-order effects
- Cortana becomes a native layer inside web browsing rather than a separate app, putting Microsoft's assistant directly on the page where users search and read.
- Windows 10 ships two browsers with distinct jobs: IE11 stays for backwards compatibility while Spartan carries Cortana and annotation as the consumer-facing experience.
Second-order effects
- Google's Chrome faces a differentiation problem it can't match with its own assistant footprint on desktop, forcing competition toward whatever assistant integration each vendor can embed.
- The April hands-on coverage already flags gaps — weak touch support and no extensions — so Microsoft must close those before Spartan's Cortana advantage matters to daily users.
Third-order effects
- If assistants keep moving into the browsing surface, the browser shifts from document viewer to agent runtime — the structural template later platforms would build on, with Microsoft positioning early via Cortana-in-Spartan.
The trend: Browsers are becoming assistant surfaces, and Microsoft's Cortana-in-Spartan move is an early data point in vendors embedding AI agents directly into the browsing experience.