writes "The British security firm mi2g has concluded a comprehensive 12-month study to identify the safest 24/7 computing environment. In the end, the open source BSD and Mac OS X came out on top with the fewest security breaches against permanently connected machines worldwide in homes, small businesses, large enterprises and governments. The study found Linux to be the most breached environment 'in terms of manual hacker attacks overall and accounts for 65.64% of all breaches recorded'. Windows was the most breached environment in government computing and led Linux, BSD and Mac OS X by far in economic damage caused by breaches."
We mentioned their previous study
too. As before, the study ignores the thousands of automatically-spreading viruses for Windows.