If you have the feeling that Microsoft could be addressing more critical vulnerabilities, you may be right. Avert Labs has counted the number of vulnerabilities rated Critical and Important over the last 2 1/2 year and plotted them cumulative by year:Critical vulnerabilities addressed by MicrosoftImportant vulnerabilities addressed by Microsoft
The top graph shows that this year Microsoft has already addressed as many critical vulnerabilities as in the whole of 2005. The bottom graph shows that the number of important vulnerabilities has not changed significantly.

Last week we wrote that we may see the start of a vulnerability growth trend fueled by bounty programs and organized crime. While too early to tell, the statistics indicate that Microsoft seems to be addressing an increasing number of critical vulnerabilities.