don't worry too much about OS X vs. windows. under leopard, if ya decide ya gotta go with windows, ya can install some versions on yer mac. if negotiations go as hoped, we'll be able to install any version of vista on them, as well. I also heard a rumour about an hack to allow that, pending completion of the deal (if any), but would advise against anybody using it. poser files are sposeta be cross-platform now. there are some glitches, but in general the files can be used without conversion or edition. IIRC, P7 SR1 re-introduced network checking, and that may mean only running one copy of poser concurrently on yer LAN.