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tidbits.com/article/13476"It has been over four years since I wrote “Should Mac Users Run Antivirus Software?” (18 March 2008). Although much has changed since then, my recommendations mostly haven’t. While Macs aren’t immune to malicious software (malware), and we even experienced one reasonably widespread incident in 2012, malware on Macs is still not nearly common enough to recommend antivirus software for everyone. And while antivirus tools are effective against certain known attacks, they often don’t provide the level of protection people expect..."
