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Is it better to sleep or shut down your Mac?

Last week I had the opportunity to attend an Apple Professional Seminar. Aside from learning the nuances of many incredible new features of Leopard Server, The speaker said something intriguing.. He said that for those shutting down the computers at night – “Bad Idea.” and that for energy efficiency, its better to leave a computer in sleep mode than to shut it down for the night. I’ve always held the logical thought that if something is off, its better for energy savings than something left in sleep or stand-by mode. So, I decided to research this claim and here are the results.
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