Windows or a UNIX based OS? Security. Flexibility. Control of features. Philosophy. Cost. Speed. Efficiency. Reliability. Clustering. Multi-user OS. Availability and choices of applications. Susceptibility to Worms and Viruses. Openness and speed of resolution of bugs. Not having the GUI or a HTTP browser as an integral part of the OS. http://www.michaelhorowitz.com/Linux.vs.Windows.html Manoj Srivastava