Removing Duplicates In Exchange/Office 365/Outlook 2013

We have Office 2013 with one Exchange mailbox (powered by Office 365).

However, due to some issues with importation and whatnot, we pretty much have triplicate of all messages due to errors on our part.

We have tried to use the clean up functionality built into Outlook, however, it seems to get rid of only a few and does not go through the entire box/folder and get rid of all the multiple copies.  (You can clearly see in each box multiple messages with multiple copies -- same sender, content, and time stamp.)

Is there a good way to do this without having to buy a program or do we have to bite the bullet and do it.
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David Johnson, CD, MVPOwnerCommented:
i've used the mapilab outlook duplicate remover to success

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There are multiple add-ins to clean up duplicates in Outlook, but I'm pretty sure all of them are paid software. There is a relatively easy and free workaround, but it requires a bit more work on your part. Gmail has the best duplicate contact detectino and merging that I've ever seen, so you can create a free Gmail account, export your Outlook contacts to that account, merge the duplicates there, and then export it back out of Gmail into Outlook. If you're interested in doing that, let me know, and I'll post the instructions.
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