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Apparently, the original developers of Mambo have philosophical differences with the organization that was managing the project and have decided to part their ways and keep their development vision intact. As such, Mambo 4.5.2.3 has been re-released with bug fixes and other modifications as Joomla 1.0.
From what I see in the Mambo related sites, most Mambo users have decided to follow the Joomla developers and not support the Mambo Foundation in their efforts.
Check out this
LINK to see what is going on.
Regards,
Roberto Artigas
If you move one grain of sand at a time to the same location eventually you will create a mountain.