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Recent malware attacks targeting Macs haven't tarnished the machine's reputation as the safer alternative to a Windows PC. Sophos experts analyzed a snapshot of 100000 Mac computers running its free anti-virus software, But for many Mac users, the Flashback Trojan has dispelled the myth of Mac invulnerability. The donationware ClamXav and the free Sophos Anti-Virus for Mac combine real-time protection and automatic updates.