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From the day I am using a MAC still I haven't encountered any virus problems. But as per my understaning, the logical truth is there is no operating system that is 100% secure or uncompromisable. And I have yet to encounter any problems with viruses on my Macs. Although viruses are not a problem, we got to think about other malwares like trojans, worms, spyware, etc. So securing a PC though its a MAC is also a must.