Windows 10 Version 1507 represents a pivotal moment in the history of personal computing. Released on July 29, 2015, under the codename "Threshold 1," this version, specifically build 10240, marked the formal launch of Microsoft's "Windows as a Service" (WaaS) model. It was an ambitious attempt to unify the fragmented experiences of Windows 7 and Windows 8.1 into a single, cohesive ecosystem capable of running across desktops, tablets, and smartphones. The Strategic Shift to "Windows as a Service"

• Start menu: The Start menu was reintroduced in Windows 10, combining the traditional Start menu with live tiles from Windows 8.
• Action Center: A new notification system that allowed users to view and interact with notifications from a single location.
• Microsoft Edge: A new web browser that replaced Internet Explorer, offering a faster, more secure, and more intuitive browsing experience.
• Cortana: A virtual assistant that allowed users to search for information, set reminders, and perform tasks using voice commands.
• Universal Apps: A new type of app that could run across multiple devices, including desktops, laptops, tablets, and smartphones.

Visual Studio (Formerly MSDN): If you have a Visual Studio Subscription, Microsoft provides legacy ISOs, including version 1507, for development and testing.

The Challenge of the ISO

Finding a clean, untouched ISO of Version 1507 (Build 10240) is significantly harder than finding ISOs for newer versions (like 21H2 or 22H2).

Conclusion

Allowed seamless switching between Desktop and Tablet modes for hybrid devices like the Surface Pro. Task View:

Running version 1507 in 2026 is highly discouraged for primary systems: