[whpalmer4]

I'm going to hedge my advice slightly since you mention unavailable actions. What I said is true for the iPad; an incomplete item with a due date which has passed will show up in the Forecast view regardless of its location in the database. However, on the Mac, the situation is a bit more complex, and a bit more care is required. There's no Forecast view (yet), and it is possible to make a perspective that would show some overdue Inbox actions but not others (the difference being whether or not a context was assigned).

The stock "Due" perspective does include the "No Context" bin, so the advice is fine for users who haven't done any tinkering with their perspectives. If you've done some tinkering, I would encourage a careful check to make sure you haven't created a potential blind spot (by omitting the "No Context" perspective, yet expecting actions with no context to be shown), as this is a case where a little knowledge might be dangerous :-)