Somehow I think that there will be a certain compatability between Poser 4 clothes and stuff and Poser 5 clothes and stuff. Maybe just more unheard of stuff in the cr3 file(LOL) and I'm sure the pz5 file structure will be seriously complex!! I would be extremely suprised (not to mention disappointed) if the ol' pz3, cr2, pz3 etc can't be loaded. Of course... I'm more interested in the library structure... I plan to update PBooost as soon as I have definate info on this so... either current PBooost users can re-structure automatically to P5 or PBooost Vxxx can be made compatible for a free update. Whatever the complexity, be sure that I will ensure you libraries are OK when you want to update to Poser 5!!!! H:)