For support for OS X Lion refer to Lion Support.For support for OS X Mountain Lion refer to Mountain Lion Support.Our experts can recommend a Mac OS X version that is right for you. If you want to buy Lion (10.7), please call us at the number 1‑800‑MY‑APPLE for pricing and products and to verify that your Mac meets the system requirements. Or you can call us at 1‑800‑MY‑APPLE to talk to a Mac expert. For Snow Leopard (10.6), you can order online.