Jeff Jones has released his six monthly report on desktop OS security vulnerabilities and Days-Of-Risk.

One highlight was the pie chart on security vulnerabilities in the different OSes.

1h08-total-pie_2[1] 

This certainly is in contrast to what a lot people are saying that Linux and Mac are more secure.

Jeff Jones Security Blog : Download: H1 2008 Desktop OS Vendor Report - Vulnerabilities and Days-of-Risk