OmniFocus doesn't support sending out notifications, either on the phone or on the desktop. It's something we might consider on the desktop in the future, but it's not imminent, and currently, at least, there are limitations that prevent support for such notifications on the phone.
Meanwhile, we recommend using iCal or something equivalent for actions with such specific timeframes (the so-called "hard landscape" items).
Meanwhile, we recommend using iCal or something equivalent for actions with such specific timeframes (the so-called "hard landscape" items).
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