also the mac os x driver for mbox is here:
http://archive.digidesign.com/download/coreaudio/
http://archive.digidesign.com/download/coreaudio/tiger/
http://archive.digidesign.com/download/coreaudio/panther/
http://archive.digidesign.com/download/coreaudio/jaguar/

What is the Digidesign CoreAudio Driver?

The Digidesign CoreAudio Driver is a multi-client, multichannel sound driver that allows CoreAudio-compatible applications to record and play back through the following Digidesign audio interfaces:

    Pro Tools|HD Accel
    Pro Tools|HD
    Digi 002
    Digi 002 Rack
    Mbox 2
    Mbox

the mbox driver for mac os x leopard installer is here, tested only with 10.5.3:
http://avid.force.com/pkb/articles/en_US/Download/en356937
^^ note that it says u should only use this driver if u arent using pro tools!! (ie using logic or cubase on 10.5 osx with the Mbox)

System Requirements — Standalone Digidesign CoreAudio Drivers v7.4.2

    The Standalone Digidesign CoreAudio Drivers v7.4.2 should only be installed on systems that do not have Pro Tools installed on Mac OS X 10.5.3 "Leopard". (instructions below)
    The Standalone Digidesign CoreAudio Driver v7.4.2 was tested and qualified on Mac OS X 10.5.3 only.
    Version 7.4.2 of the Standalone Digidesign CoreAudio Drivers includes a Universal Binary installer for installation on both PowerPC- and Intel-based Mac OS X 10.5.3.

The Digidesign CoreAudio Driver is a multi-client, multichannel sound driver that allows CoreAudio-compatible applications to record and play back through the following Digidesign audio interfaces:

    Pro Tools|HD Accel
    Pro Tools|HD
    003
    003 Rack
    Digi 002
    Digi 002 Rack
    Mbox 2 Pro
    Mbox 2
    Mbox 2 Mini
    Mbox 2 Micro (playback only)
    Mbox

other requirements for using pt le 5.2+
http://archive.digidesign.com/compato/os9/sw/macos52le.html