So the problem is when a user sorts by the from field, they get bad results. There is more than one user named "John", and they have three different e-mail addresses, but they are in the same sorting group. The only way to tell them apart is to click on each message. Also, if "John" sends from home, he may have "John Doe" as his name, his work account is "John" and mail from his phone shows up as "Johnissupergreat". So now there are 3 groups scattered all over outlook from the same e-mail address, but sorting is impossible.
Can I just sort by incoming mail, so anyone sending from firstname.lastname@example.org is all grouped together?
I know you can just search, but the user does not want that.