McOS is split up into multiple different times:
Origins is all of the events before the creation of the classic MaowcraftOS server, it did not include any story arcs as it was not an accessible period of time in the story.
Origins was an explanation of the origins of MaowcraftOS, the operating system included in the story, as well as Maowcraft's position within the company EnTech.
It is characterized only by snippets of the story given through dialogue between characters. There was an attempt made to recreate how Origins played out, known as MaowcraftOS-Spectrum which ended up becoming a Deprecated Server. Later, was replaced by a project named 'Project_REWIND' which attempted to recreate the exact Origins scenario instead of how Spectrum was a difference in the story of Origins. Project_REWIND was no longer continued and later became Deprecated Server.