Two folders same name Outlook - can't delete or rename
I have done an extensive search on this site and others and can't find a solution and I am hoping for some help.
I use a Mac Mini (late 2012) 2.6GHz Intel Core i7 running El Capitan 10.11.1. I use Safari 9.0.1 as my main browser and Outlook 2011 for email. All software is up to date.
Lately, I have been getting multiple messages from MS - "Two folders in your mailbox have the same name" - somehow I managed to set up a second "Junk" folder that I can't seem to delete and the constant flow of emails continues.
I right click and delete the Junk folder but it keeps reappearing. I tried re-naming the folder but that doesn't work either and it reverts to "Junk". I have searched and tried some of the suggestions but most don't seem to apply to Mac users.
Can anyone offer a permanent solution for a Mac user?
Mac mini, OS X El Capitan (10.11.1)