Wow, really? Windows is in danger because of Linux? Haven't we been hearing that since the late 90s when Redhat had their small boom? I have been using Ubuntu since Breezy Badger. I am an Ubuntu enthusiast, if not a Linux enthusiast, but even I realize that Linux will never surpass Windows or even Mac OSX. Do you want to know why? The development community is too splintered. Diversity and options is one of the greatest strengths of GNU/Linux OS. You can pick whatever flavor suits you. However, in terms of commercial viability, it is still too daunting for the average consumer. Consumers get confused about picking from three versions of Windows 7. There is no way they can handle the hundreds of available distros. Also, for an OS that supports a well crafted GUI (and honestly, Compiz is the superior windows manager. DWM and Quartz are outclassed), the use of GNU/Linux requires farly extensive knowledge of various command line inputs (sudo commands). Until the number of distros are reigned in and the intuitiveness of the interface is improved,GNU/Linux will remain a hobbyists OS.