Work - W2K. Some have XP, most use 98 because a) they're limited to running fairly simple a/o older programs, and b) they're computer illiterate. We're supposed to be getting a new system, though, which will require upgrades to hardware & OS.
Home - XP Pro, XP Home, W2K. Used to run linux on one box a few years ago, know it's a generally better OS, but don't have the time or inclination to keep messing with it and doing stuff like chmod 777, getting it to work with Windows apps, etc. Maybe it's easier now, don't know. One of my linux textbooks had this line: Recompiling your kernel is no more difficult than any other complex software task. Gee, thanks. And it didn't help that after that was done, system files were renamed a/o moved. Then, instructions like: First, configure your /etc/yada/blingbling script, then... Ok, that file's been renamed or moved in the new kernel, then it didn't tell you how to configure it. This is why linux is no threat to MS in home use.
T-Man, welcome back.