Amy Bennett writes "And the answer is... Microsoft. Researchers from the Swiss Federal Institute of Technology analyzed 658 high-risk and medium-risk vulnerabilities affecting Microsoft products and 738 affecting Apple. They measured how many times over the past six years the two vendors were able to have a patch available on the day a vulnerability became publicly known, which they call the 0-day patch rate. What they found: 'Apple was below 20 [unpatched vulnerabilities at disclosure] consistently before 2005,' said Stefan Frei, one of the researchers involved in the study. 'Since then, they are very often above. So if you have Apple and compare it to Microsoft, the number of unpatched vulnerabilities are higher at Apple.'"