The only un-patched, known vulnerabilities in OSX apply to _local_ users. ie. people who already have an account on your Mac!
That's bad enough! One security problem that's often overlooked is the threat your employes can be.
Think of them as commentaries on problems that you'll never have to experience, unlike certain other platforms
I don't agree. It's just that most of the expoits are hard to use onlike under Windows where many of them rely on just writing an ActiveScript. Mac OS X did have a simply exploitable issue: [docs.info.apple.com...] Security Update 2004-06-07
On the other hand, Mac OS X has a much better way of handling access to the critical parts of the system than Windows. This means that most remote exploits will only run with the privileges of the local user, whereas many exploits on Windows usually start with a privilige escalation because the normal user is inadequately shielded from the critical parts of Windows.