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Apple officially released Snow Leopard for $29 as an "upgrade" to their last operating system, Leopard. Upgrading for Leopard users cannot be more simple. To start, open up your Snow Leopard disc, and insert it into your Mac's combo or superdrive.
After you have done that, OS X Leopard should automatically recognize it. A window will pop up on your screen with a big "X" symbol. You will also see some smaller icons such as a read me and other bundled software. You can ignore these for now. Double click the large "X" symbol to get started with the installation. A screen will pop up which will ask you to confirm the install. Agree to the licensing agreement and click install.
Snow Leopard will then proceed to restart your computer and automatically install. Installation time varies on how much info you have on your hard drive. Typical times range from 30 minutes to 45 minutes.
After it is done installing, you will need to login to your computer just as you would normally. That's it, you should now have successfully upgraded to OS X 10.6 Snow Leopard. Navigate around to check out some of the new features.