At the CanSecWest security conference's annual PWN 2 OWN hacking contest Leopard was the operating system to fall fastest this year.
The competition saw hackers pitted against three laptops running Vista Ultimate SP1, Leopard OS X 10.5.2 and Ubuntu 7.10 in order to discover which OS was the most vulnerable.
It was Apple's new top of the range MacBook Air running a fully-patched version of Leopard that succumbed in under 2 minutes.
Security researcher Charlie Miller used a technique described as similar to a phishing attack, which involved clicking a link to a website containing malicious code, which allowed him to remotely access the machine via a flaw in Safari.
Miller gets to keep the Air, and wins the £5000 prize purse from sponsor Tipping Point, who has notified Apple of the flaw.