Originally Posted by http://www.theregister.co.uk/security/security_report_windows_vs_linux/
Perhaps this is why, according to Netcraft, 47 of the top 50 web sites with the longest running uptime (times between reboots) run Apache. [2] None of the top 50 web sites runs Windows or Microsoft IIS. So if it is true that malicious hackers attack the most numerous software platforms, that raises the question as to why hackers are so successful at breaking into the most popular desktop software and operating system, infect 300,000 IIS servers, but are unable to do similar damage to the most popular web server and its operating systems?