There has been a lot of FUD flying around stating that Microsoft Windows Vista is more secure compared to Linux. What has been actually compared are the number of vulnerabilities fixed, for a distribution of Linux and Windows Vista. Both 3 month and 6 month studies have been published, with the intention of showing Linux security in a poor light. Now, this is in no way an apples to apples comparison, because Linux contains plenty of applications. Furthermore, vulnerabilities for server applications had also been included. For an apples to apples comparison, just the OSes have to be compared. Now, I went to Secunia, and found out the vulnerabilities affecting Ubuntu 6.06 and Vista for the entire year 2007 till date. What I found was surprising, since in 2007, in the OS (which I took to be the Kernel + X windows + Desktop environment for Ubuntu with their libraries), Ubuntu had only three highly critical vulnerabilities. Windows Vista, in fact had 10. Check it out for yourself.