Mac OS X version 10.6.3 Snow Leopard (Mac computer with an Intel processor required) Mac computer with an Intel processor required Mac OS X Snow Leopard is built on a rock-solid, time-tested UNIX foundation. Improvements include a more responsive Finder, new look and features for Expos. New core technologies unleash the power of today's advanced hardware technology and prepare Mac OS X for future innovation: With virtually no effort on your part, Mac OS X protects itself--and you--from viruses, malicious applications, and other threats Mac OS X Snow Leopard includes built-in support for the latest version of Microsoft Exchange Server. 64-bit computing, multicore-optimization, OpenCL, QuickTime X, and more It provides unparalleled stability as well as industry-leading support for Internet standards Stacks, quicker Time Machine backup, faster common tasks and installation, a smaller install footprint, and plenty more You can use Mail, iCal, and Address Book at home and at work.