Linux
Excellent article! I have just spent the last week cleaning up a small business that had virus and malware all over their machines, it was so bad that I had to rebuild most machines used by people, the only ones I did not have to touch were a couple of machines that just run services. The company was using Exchange 2003, so I put in some Real Time Blacklists on Exchange to reduce the spam and rubbish.
I was not able to implement Linux, but absolutely agree that Linux is the way to go, I myself have always been MS but have taught myself Linux of lately and see the security advantages. I intend to move the business I mentioned above onto a Linux Server after I get them off Exchange and move their mail into the cloud.