Although OS X 10.7 Lion, 10.8 Mountain Lion, and 10.9 Mavericks have each replaced it in turn, there are good reasons you may want to (or even need to) have Mac OS X 10.6 Snow Leopard.
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We believe in the long term value of Apple hardware. You should be able to use your Apple gear as long as it helps you remain productive and meets your needs, upgrading only as necessary. We want to help maximize the life of your Apple gear.