If you go to the Curious Labs site and click on the "more info" button - it takes you to a page with this caption "Poser 5 for Macintosh?" and click on that takes you to this: "We are working on and plan to release a Macintosh version of Poser 5 in the future. Apple has introduced entirely new engineering standards, which we need to support, but require a larger workload and a longer release cycle compared to previous versions of Poser for Mac. We hope you understand and thank you for your patience. We will be announcing details on system requirements, pricing and dates when we have more solid information. Thank you for your interest in Curious Labs products!" At least they still plan to release a Mac version, but it sounds like it is going to be awhile.