This article it’s about the Safari Browser. In an article posted on June 2010 on a blog, after iPhone 4 appeared on the marked, Apple’s Safari browser was asked to be updated.
Even you are using Windows or MAC in the Safari 5.0 were found at least 48 security issues that can be easily exploited by hackers. For the ones that are using MAC Os X 10.4, that not support Safari 5.0, they are using Safari 4.1 which seems to have the same security issues like the last one.
So it really doesn’t matter what Safari are you using. Your risk to be infected is very high. By visiting a booby-trapped webpage could lead to malicious code being automatically run on your computer.
So, it seems that neither the OS doesn’t count if you don’t purchase the “the security advisory” on Apple’s website