I believe that changing geometries like the changing fantasy suit don't work in Poser5, and the cross-talk that V3 clothing takes advantage of for morphing also isn't supported by Poser5

Could be another virus which sends itself to everyone in your address book, but spoofs the headers to look like it's from soneone else in your address book. So even if it's someone you know, don't open the attachment unless the person writing tells you what it is.