Undo of the last few keystrokes.
On more than a few occasions, my fat fingers have hit a more than one key at a time, resulting in a "select all" followed by any random alpha key. This effectively replaces my entire draft email with that last solitary key stroke.
An "undo" of at least a few key strokes would have saved me many an hours work.
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Daniel Thacker
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You can try the Ctrl+z keyboard combination for the Undo command.