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Windows Longhorn was the pre-release codename for what eventually became Windows Vista, but the final product ended up being very different after a total development reset in 2004. I take a look back at some of the pre-reset builds of Windows Longhorn and find out how well they run in 2021.

Thanks to Gareth Williams for supplying me with the PC used in this video.

▬ Contents of this video ▬

0:00​ - Intro & Project Overview
3:47 - Build 3683 Overview on Real Hardware
10:18​ - Brilliant Sponsor Message
11:53 - Build 4074 VirtualBox Install
14:20 - Windows Longhorn 4074 Demo
20:25 - Running 3rd Party Software
22:01 - Conclusion

My retro gaming podcast: http://theretrohour.com​

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Software sources:

Sigma OS 3.0: https://archive.org/details/sigma-os-...
Windows Longhorn beta archive: https://winworldpc.com/product/window...

Sources used in this video (under fair use or with permission):

Longhorn Concept "WinUI Prototype":    • Longhorn Concept "WinUI Prototype"  
Longhorn Concept "we're just getting started"/"Aero feel concept":    • Longhorn Concept "we're just getting ...