I’m not sure when this happened, but I just noticed that when I now move mails to folders, the appear alphabetically, regardless of case.
In the past, upper case was listed first, then lower case. So eRetail came after TWiT and Versicherung (insurance) . As I went to move an email today, the list was shown in proper alphabetical order. So Microsoft has dragged Outlook for Androids sort routine out of the 1970s and brought it up to date!