Security Report: Windows vs Linux

The results were not unexpected. Even by Microsoft's subjective and flawed standards, fully 38% of the most recent patches address flaws that Microsoft ranks as Critical. Only 10% of Red Hat's patches and alerts address flaws of Critical severity. These results are easily demonstrated to be generous to Microsoft and arguably harsh with Red Hat, since the above results are based on Microsoft's ratings rather than our more stringent application of the security metrics. If we were to apply our own metrics, it would increase the number of Critical flaws in Windows Server 2003 to 50%.
http://www.theregister.co.uk/security/security_report_windows_vs_linux/
http://digg.com/linux_unix/Security_Report_Windows_vs_Linux_2

Windows Server 2003 Enterprise
Affected By 126 Secunia advisories
Unpatched 8% (10 of 126 Secunia advisories)

Windows Server 2003 Datacenter
Affected By 124 Secunia advisories
Unpatched 8% (10 of 124 Secunia advisories)

Red Hat Enterprise 5:
Affected By 21 Secunia advisories
Unpatched 0% (0 of 21 Secunia advisories)

Windows Vista:
Affected By 8 Secunia advisories
Unpatched 25% (2 of 8 Secunia advisories)

Ubuntu 7.04:
Affected By 9 Secunia advisories
Unpatched 0% (0 of 9 Secunia advisories)

Windows XP:
Affected By 183 Secunia advisories
Unpatched 16% (30 of 183 Secunia advisories)
The most severe unpatched Secunia advisory affecting Microsoft Windows XP Professional, with all vendor patches applied, is rated Highly critical

Ubuntu 6.06 LTS:
Affected By 136 Secunia advisories
Unpatched 0% (0 of 136 Secunia advisories)