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I think the short answer is yes, judging from the amount of Macs I see that owners don't bother to update. As was pointed out, the recent events were malware instead of viruses, but so the heck what. Whether a a vulnerability exists on your Mac because of the OS, Java, MS Office or whatever else you can think of, that doesn't make it less of a problem. So you get SabPub and Flashback. Virus, Trojan, whatever, pick your poison. Hopefully, this "outbreak" will result in more Mac users actually updating their software.