I have numerous outdated categories that originated in a Windows version of my outlook DB and that show up in the side folder pane. I would like to delete them. However, they are not listed in the Categories list (Please see image below). I have tried to clear all categories on Mail, Calendar, People, Tasks and Notes but the old categories remain. I use Mac OS X v10.10.1 and Outlook for Mac v15.3. Thank you for your help.
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