Answer Best answer as chosen by user pikov
Mac users upgrade for a number of reasons.
No one has ever said, seriously, that OS X is impervious to viruses and malware but, while OS X is reasonably secure, it is a fact that there are currently no viruses out there that work in OS X.
Apple, like Microsoft, is continuously looking for ways to improve the security of their OS. They do this with the aid of people who find holes, for want of a better word, in the OS that "may" cause problems.<div><div>Apple/Microsoft then releases a Security Update to plug that hole. Sometimes quickly, sometimes not so much.
Malware on OS X is also very limited but OS X, from Snow Leopard on, has a Malware Detection App as part of the OS.
Updates to it are pushed out via the Software Updater.
Improvements to various Apple Apps, iTunes, iPhoto, iMovie, etc., are also updated via the Software Updater app, although some of the updating process is now being transferred to the App Store with an automatic indication of update availability.
Perhaps if your acquaintance were to use the Software Updater on a regular basis, she would have found that her problem went away.
She could also have asked on the Mac forums, here on CNET, and been given an answer that would have solved her problem.
Bottom line, Yes, your friend may well be opening the door for future trouble.
Hope that helps
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