For 2.5 years now I am completely on Linux. And I can honestly say I'm a happy customer. I am running a Linux operating system on my ThinkPad with all business relevant software running smoothly on it. IBM Lotus Notes runs perfectly on Linux, and so does IBM Lotus Symphony for office applications implementing the Open Document Format (ODF), and so do the IBM collaboration tools, e.g. for instant messaging, etc. I have a choice of web browsers, e.g. Firefox and Google Chrome. And a lot more business critical software runs without problems.
Linux is fast - the machine boots in next to no time - and extremely reliable. Updates are automatically provided and security is dealt with very elegantly. In other words: Linux really made it.
These days Linux celebrates its 20th anniversary. An operating system for everyone. Easy to get, easy to install, easy to use. A great success story.
The Linux Foundation has produced a lovely little clip on the story of Linux. It is available on their website as well as in youtube.
Take a look - it is good fun....