as far as I'm aware there is only 1 Anti Virus product available for the Mac. As Viruses are just not an issue for us Mac users we never go looking for anti virus software. The Mac's operating system is based on Linux which is the most secure OS available.
I bet i get a virus now!!
Most types of software are available for Mac. MS do Office for Mac and there are a fair few free programs that emulate windows versions of software. The thing with Mac software is this....
A windows program may have 20 different companies versions but there will only be 1 or 2 for the Mac. You can still do most things with Macs. Lightroom and now other programs come with 2 discs, a windows version and a Mac version.
I have had my iMac for over 3 years and i have never had such a stable, easy to use, reliable, good looking, intuitive PC in my life. It's such a hassle free (almost) PC. No PC is perfect but this is as close as I have got. Yes they are expensive but i usually get through a PC every year to two years and this is still as good as when it was new which is why they hold their price used. I really do expect to be using it for the next 2-3 years if it doesn't go POP! So yes they are expensive to buy but cheaper in the long run.