View source for Sigma OS

{{Infobox bootleg
|screenshot = Sigma Desktop Aero.png
|original_os = [[:Category:Bootlegs based on Windows betas|Windows Longhorn Build 4074]]
|release_date = March 8, 2013
|creator = urban92
|country = Poland
|language = English
|arch = x86 (32-bit)
|size = 1.1 GiB
|download = {{link|url=https://crustywindo.ws/collection/Betas/Sigma%20OS%203.0%20M6.iso|name=Sigma OS 3.0 M6.iso}}
|archiveadd = December 27, 2021
}}
'''Sigma OS''' is a series of mods based on Windows Longhorn designed to make it more stable and "usable". It was created for Techvortal by urban92. The latest version, M6, which is based on {{link|url=https://betawiki.net/wiki/Windows_Longhorn_build_4074|name=Longhorn build 4074}}, was released on March 8, 2013. It was added to the archive on December 27, 2021.

== Description ==
The bootleg itself is based on Longhorn build 4074, which was a Milestone 7 build of Windows Vista, which released in April 2004, before the development reset. The OS is mostly stock except for some integrations, icon replacements, and themes. Certain programs are taken from other Longhorn builds in order to make it more "stable".

== Changes from Windows Longhorn 4074 ==
=== Minor changes ===
* The 180 day timebomb from the original build has been removed, so you do not need to change the date to use this mod.
* Some updates have been added, including Internet Explorer 7 beta 2 and Windows Media Player 11.
* Partial exFAT support was added.

=== Look and feel ===
* The default theme has been replaced with a theme called "Aero mod by urban92".
* The cursor has been replaced with the one from Windows Vista build 5384.4.
* The sounds have similarly been replaced with the ones from Windows Vista build 5384.4.
* Some icons have been replaced with ones from Windows Vista. 

== Software ==
* 7-Zip 9.20
* Paint.NET v3.36
* Opera 12.14

== Notes ==
=== Bootleg quirks ===
* Windows Update, System Restore and WinFS are not present.

== Gallery ==
<gallery>
Sigma Setup.png | Setup
Sigma Installing.png | Installation
Sigma First Boot.png | First boot
Sigma Desktop.png | Empty desktop
Sigma Desktop Aero.png | Empty desktop (with Aero)
</gallery>

[[Category:Bootlegs originating from Europe]]
[[Category:Bootlegs based on Windows betas]]
[[Category:Bootlegs]]