need software to remove duplicate emails from Outlook 2011

My Time-Warner POP server just duplicated 1000s of e-mails in my Outlook 2011 inbox ... this happens about once per year. Time Warner support will not help me, saying it is a problem with Outlook, and the Microsoft tech documents suggest it is a T-W server-related issue.

Since I will need to remove theses e-mails myself (3rd time in three years), I'm looking for a duplicate e-mail removing software or add-on that works for Mac Outlook 2011. There are several for the Windows 2010, 2013 versions etc., but can't find anything for the Mac so far. There are a few suggestions of running a script, but from what I've read, that is a slow and unreliable process.

Also, for the Windows Outlook 2010, there was a work-around suggested to add the "modified" field heading to better find and sort for email duplicates, however, for the life of me, I cannot find that field being an option in Outlook 2011 ... does it exist? When I was using the previous Entourage 2008, there seemed to be additional fields and flags that helped in a similar fashion (duplicates showed-up with a unique icon flag that help to sort for them) ... are these icons absent in Outlook 2011 or just hidden?

Thanks in advance for any suggestions!