Microsoft Windows has <A HREF="http://news.zdnet.com/2100-1009_22-6169956.html?tag=nl.r23660">the lowest number of vulnerabilities</A> and the fastest turnaround time for patches of all commercial operating systems--but it also has the most serious flaws, according to Symantec.

Despite having the fewest security holes, Windows was hit by more critical flaws than either Red Hat Linux or Mac OS X, Symantec found.