I've worked for a few companies where free software formed the backbone of their infrastructure - I've worked for more companies where Unix formed the backbone. However, that doesn't imply Windows is only found on the fringes of the company. In almost all companies, including "Unix companies", the default desktop is a Windows machine. Except from the occasional graphics designer, or an otherwise "arty" person on a Mac, allmost the non-tech people nowadays work on Windows (only exception I know from the top of my head: two university secretaries on Sparcs, who were real wizards with Emacs and LaTeX - but that was around the time Windows 3.1 was very new). And even a lot of tech people use Windows - unlike an oldie like me, youngsters started their computer lives on Windows. I never use Windows myself, and although I'd like to see it different, I can't image an office using Unix on the majority of their desktops.