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|download = [https://crustywindo.ws/collection/Betas/Sigma%20OS%203.0%20M6.iso Sigma OS 3.0 M6.iso]
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'''Sigma OS''' is a series of mods based on Windows Longhorn designed to make it more stable and "usable". It was created by techvortal and the latest version M6 was released on March 8, 2013.
==Description==
The OS itself is based on Longhorn build 4074, which was a Milestone 7 build of Windows Vista released in April 2004, before the development reset. The OS is mostly stock except for some integrations, icon replacements, and themes, and certain programs are taken from other Longhorn builds to make it more "stable".
==Changes from Longhorn 4074==
*The default theme has been replaced with a theme called "Aero mod" by urban92.
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