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It is not needed.

Yesterday came the first mac virus (a probably soon-to-be-patched problem with java in quicktime) and it is not in the wild. Norton does not protect against this.

Norton searches for Windows viruses in case you want to send files to an unprotected PCs.

It also slows down your mac.
 
Beat to it, but he is right. Nortan can slow down your mac. Thats why I deleted mine.

Understated at best. Norton can cause more headaches than you can imagine. But as long as you don't mind reinstalling the OS every few weeks - it's rock solid - ;)
 
Why do they even sell Norton for Macs? That's the only app I can think of that should be Windows-Only!

In short: Norton is not needed, and as said before, you are better off without it. We are not kidding.
 
Yesterday came the first mac virus (a probably soon-to-be-patched problem with java in quicktime)
That is not a virus, it's an exploit that requires the user visit a malicious web page. It's not anything any security software could protect against.

There's 0 reasons to have Norton on your Mac. There are no viruses in the wild.
 
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