That's a completely different topic to what I was discussing. But, for the record, in the real world, and not counting theoretical vulnerabilities, the recent MacDefender malware was the first mainstream malware to EVER hit Mac OS X, in it's ten years of existence. There has never been a real-world virus for OS X.
Anecdotally, I've never, ever had to install anti-virus software on any of the hundreds of Macs I've administered in my career, and I've never, ever had to do a clean install of OS X because of malware infection. Of those hundreds of Macs, I've seen MacDefender malware installed on one machine, ever. It was removed without trace within 30 seconds.
But I've had to do clean installs more than a dozen times on Windows machines that have become so infected as to be unusable. Symantec's database lists 1.5 million virus and malware variants for the Windows platform.
Now, I NEVER taut OS X is being invulnerable, because it isn't. But you'll note that Apple don't either. From their website:
Security Advice
The Mac is designed with built-in technologies that provide protection against malicious software and security threats right out of the box. However, since no system can be 100 percent immune from every threat, here are some other ways to help keep your information as safe as possible:
Download files only from known and trusted websites.
Use FileVault 2 to encrypt everything on your Mac.
Control access to your Mac by locking your screen after a period of inactivity.
Securely delete outdated sensitive files with the Secure Empty Trash command.
They have malware counter-measures built in to the OS, which have been expanded since MacDefender occurred. And they haven't really pushed security in their marketing for several years. The simple, real-world facts show that OS X has less security vulnerabilities, less attempted attacks, and less interest from attackers, than Windows.
So, when you say "which can lead to all sorts of problems for them.", which problems do you mean? Because, as I say, I've administered hundreds of Macs over the past ten years and have never installed anti-virus software on any of them. With the exception of one piece of nuisance-ware a few months ago, I have never ever seen any evidence of a Mac that has been compromised because of a security flaw.
