I would agree with Glenn. My home network is WS08 and all Vista clients and every Kix script I have in my library from back to WS2K and WS03 works just fine. I'm sure it depends on how you use Kix and which particular commands or functions you use and so forth, but in general it works fine. I would just recommend testing it yourself to see how it works. It's not like Kix is "old" or becoming obsolete. It's very mature and stable and widely used by a great many people around the world.
_________________________
silence is golden, but duct tape is silver