Quote Originally Posted by Ynot View Post
no, exactly the opposite
being Unix certified means the OS is a Unix operating system
rather than just Unix-like

see here for a summary list of Unix certified OS's
http://www.opengroup.org/openbrand/register/

but to be honest, Unix certification means jack shit now-a-days
there's some places that will only install an OS if it's Unix certified, but they're few and far between these days
OS X is based on BSD, though. Unix certification might mean that it is actually Unix in some cases, but it's simply Unix-like in the case of OS X.