This is such a stoopid question that I hesitate to ask it; but I've grepped & Googled and even asked a Magic 8 ball....
How do I move within a mailbox? Not scrolling a few messages at a time, but jumping to the beginning or end or 10 screens down?
I see mentions in various help files of a set of arrows <-- --> but they are not on my version; you do get such when looking at a message, but that increments you. I need a Clark Kent leap.