The Halloween Documents revealed how Microsoft planned to extinguish Linux, but the open-source community turned it into a weapon

The Halloween Documents revealed how Microsoft planned to extinguish Linux, but the open-source community turned it into a weapon

By Simon Batt
Publication Date: 2026-09-20 00:00:00

Linux is the most popular open-source operating system in the world, but its road to this point was not without its perils. Part of its popularity is due to AT&T suing Berkeley over 186 lines of Unix code, which allowed Linux to flourish. Without that lawsuit, who knows where Linux would have been?

However, after the OS caught its stride, it quickly found itself in the sights of the biggest OS developer in the world: Microsoft. What followed was a document detailing how Microsoft could extinguish this developing scene, which would eventually be known as the Halloween Documents.

The document spells out everything happening in the world of open-source software

It’s a great read if you’re up to it

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