A mate of mine who has only been using Macs for a few weeks has been using a PowerBook G3. We installed Mac OS X 10.4 Tiger on it, and then he got a larger hard drive. He was about to reinstall OS X when I suggested cloning.
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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.