AFAIK these so called viruses try and install a video codec that's unknown by the user - they ask for an admin password and can mess stuff up

but they can't affect root ( the main system ) and you'd have to be daft / very drunk to just install any old thing on your mac in the first place

tip 1. when surfing porn - turn off java and then you won't get silly problems like this in the first place

:) 

Trojans and viruses are completely different. A trojan is just a piece of software which doesn't do what it says on the tin. You install it thinking it's going to install a codec etc... when in fact it just deletes files. I believe there are others out there for Macs, but it's not a 'vulnerability', it's just a disaster waiting to happen to incredibly stupid people...

Viruses are different however, and there has only ever been one self-spreading one for OS X, which was still a kind of trojan in part.

There have never been any 'effective' viruses/trojans for OS X, because of the two or three that have come into existence, they've all been pretty badly designed and require a lot of 'help' from the user to get them working (such as actually going through an install process).

In the near future, i (unfortunately have to) install Office for Mac,
to open and work with Powerpoint, Word, Excel.
The email/project-software that comes with Office for Mac is called Entourage.
So that means Windows-software on my Mac, which, from what i've heard, a potential security issue. 
As i have have always used Norton Antivirus on my Windows computers,
i thought it would be wise to buy Norton Antivirus for Mac,
which i bought from the Apple Store.
I have not yet installed the software, as i would like to know what you think about this.
Is it wise to install antivirus, because i will receive email in a Windows/program (Entourage) ?

Thanks 🙂 

Is Apple link not good enough?

It will slow things down considerably, and generally not be much help.

You are of course, aware that there are alternatives to Microsoft Office which still support the same files. iWork has the ability to open and save Word, Powerpoint and Excel documents (although it's not obvious), and there is of course NeoOffice (although this isn't very good).

not good enough?

 

 

I don´t know, i don´t have much experience with Apple products.
Will it make a difference regarding security issues ?  

Thanks,

Leaving it to Apple, that means just check for updates frequently ?