During 2007, Apple has patched more than ten times the number of critical vulnerabilities in Mac OS X compared to the number patched in Microsoft Windows.
George Ou, a writer for ZDNet Australia sister site ZDNet.com, analysed in-depth statistics from security research company Secunia as a basis for his research. He found that Apple's latest operating system, Mac OS X, faced more critical flaws than Windows XP and Vista combined.
While Mac OS X had 234 highly critical vulnerabilities reported in 2007, Vista and XP combined had 23, Ou wrote.
"This shows that Apple had more than five times the number of flaws per month than Windows XP and Vista in 2007, and most of these flaws are serious," wrote Ou. "Clearly this goes against conventional wisdom."
Macs have traditionally been viewed as suffering from fewer vulnerabilities than Windows.
Ou made the comparison as an indicator of how many vulnerabilities might exist in 2008, rather than a comparison of the relative security of the operating systems. He said that security had improved with both Windows Vista and Mac OS X Leopard (version 10.5) this year.
Some experts have said that counting vulnerabilities is not necessarily reliable as a measure of security.
Tristan Nitot, president of Mozilla Europe, told ZDNet.co.uk this month that it was more important to take into account the time it takes to patch vulnerabilities.The amount of exploit code available in the wild also has an impact on security. While there are thousands of pieces of code that seek to exploit Windows XP vulnerabilities, exploit code for Mac OS X is relatively rare.
The problem is that once malware does start to surface does the Mac, and I believe it will, Mac users believe they are totally invulnerable and do all sorts of things that a typical Windows user wouldn't even think about. Opening emails from unknown people, running unknown files, etc. It'll take a while to train Mac users to be as diligent as Windows users.
Someone in the other article you linked to also commented on the fact that Linux/Unix doesn't see as many viruses/trojans as Windows, even though the Linux/Unix market share is greater than the Mac. The reason, I believe, is because the Unix community is generally much more computer-savvy than the Windows market. And Unix users know all about "best practices" and that sort of thing.
Anyway, I don't think the threat to the Mac is as great as the anti-virus companies probably would like us to think. Not yet, anyway. But I don't think it's going to stay that way forever.