Apple - Sent items listed by sender's name (my name!) not recipient in Outlook for Mac 2011

Changing the "Arrange By" value from "Date received" to "Date Sent" on the top of the mail list solved this issue for me.

Note that if you are using Outlook 2011 for Mac with Exchange then you may have to right-click/control-click on 'Sent Items->Folder Properties' and then click 'Empty" to empty your cache before this technique of switching from 'Date Received' to 'Date Sent' will actually work. You need to have your 'view->Navigation Pane" selected to see the 'Sent Items' folder you have to click on. Once I emptied my cache, this worked like a charm. Thanks!

Click on the sent icon between inbox and drafts.

You may need to do this each time you access the sent lists. It works for me. Not satisfactory, but achieves the desired result.