basalgangster wrote a good article on A/UX (read it here http://basalgangster.macgui.com/RetroMacComputing/The_Long_View/Entries/2010/9/25_A_UX.html). Among other general observations about the OS, he wonders why didn't Apple pursue the Unix strategy. He points out that Apple was dumping copious amounts of cash in creating a new OS and exploring using other OS cores (like Windows NT). And as everyone here knows, they ended up with something similar by going with NeXT OS. It certainly seems to me that they could have had a huge technological leg up on everyone and opened up new doors in the corporate market by sticking with A/UX.