Mbox 2 Pro Drivers have been updated with Mountain Lion support.
Is there any news about Mbox 2 USB Driver update? ->
http://duc.avid.com/showthread.php?t=333084
Don't ask me how (or why) I managed to do this but I'm running PT LE 8.0.5 & Logic Pro 9 on OS X 10.8.3 Mountain Lion and it's working ok. Except MIDI.