Add sort by "From" email to the "New" mail folder when using the "use New/Old style" mail layout. Sort by "From" works for spam folder, and all other folders but not "New" (or "Old", which I don't really need sorting for but other people may).
I get over 200 email a day and for over a year have been asking for the feature, BUT on deaf ears. --- MY WORK AROUND: To get around this I (1) select all mail in the New mail folder; (2) move them to a new / empty folder (e.g., "Temp New Mail"; (3) I sort by email address in the new folder, and delete groups of email not important; and (4) I move the remaining emails back into the New mail folder where I work them. This works but is prone to error (I recently had 800+ new emails after being on vacation 3 days, and after selecting all of them I inadvertently "Mark Read", which put all of them (unbolded) into the old mail folder. What a mess trying to identify the real unread ones!!!