D0 I need security for my computer?

I have heard that there are no viruses that can attack Mac os.
Does this hold true with spyware, worms, malware etc?
DO I need to get a firewall or anti spyware software to e secure?

Mac's are less vulnerable out of the box than Windows machines by design but that doesn't mean they are invulnerable.
There are many many more Windows machines in the world than Macs which has made them the primary target for those that derive perverted satsifaction from trying to disrupt things for others. As Macs get more popular, they will be more actively targetted and there is no doubt that vulnerabilities will be discovered and some sad people will try to exploit them with malware.
Make sure you run Software Update on a regular basis because Apple are pretty good at plugging those holes that are discovered.
Read the security advice on Apple's web site and be aware of what you are doing as you open up services on your Mac's firewall.
I think that this article (http://www.thexlab.com/faqs/malspyware.html) is a pretty good summary of what to do.
So far, in four years of OS X use, I have not experienced any ill effects from malware. That doesn't mean I shouldn't continue to be careful - just like in all aspects of life
Enjoy your Mac!!

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    Check out User Tip:   Viruses, Trojans, Malware - and other aspects of Internet Security and http://www.thesafemac.com/mmgMac Malware Guide.
    ===================
    Viruses:
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    Macs:  iTunes Store- About authorization and deauthorization.
    Windows: How to Authorize or Deauthorize iTunes | PCWorld.
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    I need to authorize my computer and I can't find the link for it. I looked under Itunes store and there are no links that say "advanced" or "authorize computer"

    Authorization
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    Windows: How to Authorize or Deauthorize iTunes | PCWorld.
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    Mac OS X 10.5 Leopard installation system requirements
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    http://support.apple.com/kb/HT1544
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     Cheers, Tom

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