numanoid "You don't LOSE compatibility with other software" I disagree, one of the complaints about Poser 5 was the loss of some import/export capabilities with some of the high end packages, which is why we now have to buy Body Studio. ==================== Even if you mean the missinf Poser Pro plugins that aren't in P5, those still aren't lost from your Poser Pro installation that you're upgrading from. Ditto Poser 4 - nothing is lost by upgrading, Poser 4 is right there on your hard drive.