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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 havent. While Macs arent 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 dont provide the level of protection people expect..."