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The "Sent Items" folder has the To/Subject sort option rather than the From/Subject sort option that the other folders have. This is great but many people have a "Sent" or "Sent Messages" folder from their phone or other device and they either don't know how to change the default send folder on the device or the device doesn't have that feature. I propose that any folder that starts with the word "Sent" default to the sort option of To/Subject rather than From/Subject. I doubt most people need to sort by "From" when all of the email is from them :)