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Norton is not compulsory for mac. Mac generally does not get viruses and hence one can fare well even with out an anti virus in case of mac. In fact avast is a better choice of anti virus for mac in comparison to the Norton anti virus.

When it comes for detecting virus`s Norton is the best because it detects viruses, spy ware, Trojan horses, worms, bots, and root kits. But, when it comes for resource utilization it is the worst among all other anti virus. It even has an intelligence-driven technology for faster and shorter scans. It even has a technology of guarding against web attacks also.

most of the users who use the antivirus softwares in their pcs terms the norton the best antivirus software. they give the second number for the avg. but i personally used the both software and i dont recommend the Norton because when you install norton in your system then your system becomes occupied by it and the speed of your pc is slow then., Jason Gagnon