Apple's OS X.

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The most comprehensive study ever undertaken by the mi2g Intelligence Unit over 12 months reveals that the world's safest and most secure 24/7 online computing environment - operating system plus applications - is proving to be the Open Source platform of BSD (Berkley Software Distribution) and the Mac OS X based on Darwin. This is good news for Apple Computers(AAPL) whose shares have outperformed the benchmark NASDAQ, S&P and Dow indices as well as Microsoft (MSFT) by over 100% in the last six months on the back of revived sales and profits. The last twelve months have witnessed the deadliest annual period in terms of malware - virus, worm and trojan - proliferation targeting Windows based machines in which over 200 countries and tens of millions of computers worldwide have been infected month-in month-out.