Apple Mac OS X Leopard 10.5.6

Manufacturer: Apple
With Mac OS X Leopard, the worlds most advanced operating system is now even better. Leopard is loaded with innovations-starting with an amazingly trouble-free installation if you're upgrading your Mac. Its never been easier to find, arrange, and share everything on your computer. Organize your files in stacks, browse files with Cover Flow, use Quick Look to preview files without even opening them, go back in time to restore old files with Time Machine, send email using personalized stationery, add effects to video chats and much more.