Upgrade from Mac OS X Leopard with Snow Leopard, a simpler, more powerful, and more refined version of Mac OS X. It delivers a wide range of enhancements, next-generation technologies, out-of-the-box support for Microsoft Exchange Server, and new accessibility features. It’s the world’s most advanced operating system, optimized from installation to shutdown. Snow Leopard is an upgrade for Leopard users and requires a Mac with an Intel processor.