eldavojohn writes "A ZDNet blog reports stats from Secunia showing OSX averaged 20.25 vulnerabilities per month while XP & Vista combined averaged 3.67/month. Is this report card's implication accurate, or is this a symptom of one company turning a blind eye while the other concentrates on timely bugfixes? 'While Windows Vista shows fewer flaws than Windows XP and has more mitigating factors against exploitation, the addition of Windows Defender and Sidebar added 4 highly critical flaws to Vista that weren't present in Windows XP. Sidebar accounted for three of those additional vulnerabilities and it's something I am glad I don't use. The lone Defender critical vulnerability that was supposed to defend Windows Vista was ironically the first critical vulnerability for Windows Vista.'"