It introduced the world to the mouse, scroll bars, and basic apps like Notepad and Paint. How to Safely Find Legacy ISOs

Tech historians and digital preservationists sometimes refer to the earliest leaked builds from the 1983-1984 era as "0.x" builds. These ISO or floppy images are highly sought after by retro-computing enthusiasts but are not functional for daily use. 2. "Windows 0" Fan Projects and Mods

Because Microsoft skipped a "Version 0," the hobbyist community has occasionally filled the gap with fan-made ISOs.