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If you plan to make a YouTube video or other content using bootlegs downloaded from our site, although we can't and won't force you to do anything, we greatly appreciate attribution for the large amounts of time and effort we spend finding these bootlegs. Thank you!
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{{Infobox bootleg
|screenshot = Sigma Desktop Aero.png
|original_os = [[:Category:Bootlegs based on Windows betas|Windows Longhorn Build 4074]]
|release_date = March 8th, 2013
|creator = techvortal
}}
'''Sigma OS''' is a series of mods based on Windows Longhorn designed to make it more stable and "usable". It was created by techvortal. The latest version, M6, which is based on [https://betawiki.net/wiki/Windows_Longhorn_build_4074 Longhorn build 4074], was released on March 8th, 2013. It was added to the archive on December 7th, 2021.
== Description ==
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