Hornet, seriously, don't even go there, Windows is probably the worst, most insecure and flakey OS in existence, and the web is awash with demonstrations of why the Windows OS is flawed by design.  You don't need virus protection on a Debian installation, Debian is a totally different take on an OS to Windows.

You're comparing a commercially developed OS to a publicly designed and audited one - there is no comparison.

David literally just shot himself in the foot by admitting that Linux has it's strength in security and that's why almost the entire web is based around it.  Windows servers aren't popular because the web companies that host them know which is best, and that is a Linux server, not a Microsoft one.

You cannot trust an OS developed behind closed doors no more than you can trust a server that was developed that way, and anyone who thinks that trusting a commercial OS is better than trusting a publicly audited one, has reasoning far beyond my comprehension.