Ah good, we haven't seen this question at least 2 or 3 days. To answer your question: No, you can not use any existing models in Poser 5. Everything except the P5 models are now obsolete and must be deleted from hard drive or P5 will not install. When you load the P5 CD, it will look for any old Poser models, delete them, reformat your hard drive, and then send an e-mail back to the comapny telling them that you are using a competitor's product.