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When a folder has focus, press any letter to move to the first folder beginning with that letter. Press repeatedly to cycle through the folders beginning with that letter.
When using the Calendar: Alt+[number]: Select a day in your calendar and press Alt+ any number
between 0 and 9 to see the current day plus the next days. For example,
Alt+9 shows you today and the next 8 days (0 shows 10 days total). This works with any calendar Alt+view and switches you to the 1 Day view.