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Windows Vista - 6 Month Vulnerability Report [blogs.csoonline.com]The results of the analysis show that Windows Vista continues to show a trend of fewer total and fewer High severity vulnerabilities at the 6 month mark compared to its predecessor product Windows XP (which did not benefit from the SDL) and compared to other modern competitive workstation OSes (which also did not benefit from an SDL-like process).
This is a report by a Microsoft employee which will surely raise all sorts of instantaneous doubt from those who don't bother to download and read the full report.
Could it be possible that Vista is more secure than these other operating systems?
As far as I know the report did not state how long it took Microsoft/RedHat/Ubuntu to correct the security errors once they were discovered.
It might be the case that Vista is more secure when it comes to vulnerabilities than the other operating systems in the report. Or fewer problems were discovered in Vista, but they are still lurking around.
Anyhow security isn't only about number of vulnerabilites during the first six months of use.