@the replies to bobdevis - Windows/Linux market share
We have 10 Windows servers and 35 Linux servers i.e. 12% Windows 78% Linux.
Our purchases of Windows licenses were recorded. Our CentOS installations from templates (which must be a really common way to roll out Linux servers) are not recorded.
All market share surveys I've seen would count companies like us as 100% Windows shops, but it couldn't be further from reality.
60% of web servers run Linux. 40% run Windows. It's very easy to determine web server market share by OS reliably, because web server software identifies itself. Source: Steve Ballmer http://www.pcworld.com/businesscenter/article/151568/ballmer_still_searching_for_an_answer_to_google.html
The question is whether web server OS market share is indicative of non-web server market share (the OS running on servers which are not directly on the Internet). In our case it is indicative.
You do realise that most general server OS market share "reports" by the likes of IDC are based on Linux Vs. Windows server *revenues*? Can you spot a problem there?
Regarding the suitability for Linux versus Windows on servers. Does Microsoft compete on performance anymore? Name a benchmark that shows Windows is a better choice.
The only thing Microsoft is competing on is "familiarity". And that is shaky ground.