M-OS has little downloads. Here are some versions of M-OS still available.

Millennium OS 2004
This copy of Millennium OS is an annual edition of M-OS written to keep people up to date with a normal 2004-style PC desktop. Simple and easy to operate.

Millennium OS Alpha
The first version of Millennium OS with a Windows Explorer-like desktop operating environment. This copy of M-OS is the first kernel to read files from a folder, called "DESKTOP", and write them to a file which is then read by M-OS's kernel.

Millennium OS Beta
Just the same as Millennium OS Alpha, but with some minor improvements and programs.