Linux Most Attacked Server?
Anonymous guy who can't remember his login sent in a story from the Globe And Mail that says "During August, 67 per cent of all successful and verifiable digital attacks against on-line servers targeted Linux, followed by Microsoft Windows at 23.2 per cent. A total of 12,892 Linux on-line servers running e-business and information sites were successfully breached in that month, followed by 4,626 Windows servers."
Uh, ever heard of Solaris? FreeBSD? Companies still run web servers on these operating systems, because Solaris and FreeBSD whip the llama's ass in stability over Linux.
Also, there are some companies that will mess with HTTP headers to return different strings or no string at all, and in the case of Netcraft these don't get counted towards the final numbers. Apache is easily configured to return whatever server string you desire.