In this age of rapidly evolving web applications, social networking and internet mobility it's easy to forget (or for some perhaps not even realise) that all this "stuff" has to run on something, the "something" being a server or server platform (or even a "web-farm" if you prefer the more contemporary term). As buildings and builders are to people and society as are servers and infrastructure developers to web content.
I don't doubt the majority of people will have heard of the internet, equally as many of Microsoft, but what of Linux?
Linux is the predominant server operating system around the internet with Linux based platforms presently delivering around 80% of all web content, that's some market share, especially for what is in essence a community developed and totally free operating system. Microsoft doesn't get a look in as contrary to what you might be led to believe it's just too high maintenance and isn't stable enough for sustained efficiency. There is no doubt that Microsoft do "business" very well, the MS Outlook/MS Office/MS Exchange/Active Directory combo is king of the enterprise hill (although I would personally recommend the forward thinking cloud wonderfulness of Google Apps myself) however for real computing, where security and reliability are crucial, it has to be Linux.
Linux is actually a fork of UNIX with underlying concepts and modular construction the same as they were when UNIX was first developed by AT&T way back in 1969. You think the latest cutting edge technology is actually "cutting edge? Not so, even OSX, Apples flagship operating system, runs a version of UNIX under the skin (Darwin), which is why it's so stable and resilient to viruses.
UNIX commands. Linux serves.