Only when Firefox AND Thunderbird are active/open, the desktop will NOT go to sleep
I have analysed all services, startup programs and none of these causes a NON sleep issue. Only opening Firefox: it still works (slepp modus). Only opening Thunderbird: sleep modus okay. ONLY when both are open, sleep modus will not be activated. This occurs on any 2 of my Vista, HP desktops!
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Are one of them configured to not sleep? http://www.cnet.com/news/how-to-prevent-sleep-in-os-x/