As you will see later in this article, the product is designed not just to remove Outlook duplicate emails, but also to perform other critical mailbox optimization steps and make Outlook regain its lost speed. It is designed to work with all Outlook versions, including Outlook 2013. How to remove Outlook duplicates with the Weight Diet add-inįirst of all, you need to download & install Weight Diet for Outlook. In this article we will detail how to automatically remove Outlook duplicate emails using Weight Diet, an Outlook optimization add-in designed to remove duplicate and obsolete items from Outlook mailboxes. For various reasons, we all end up having to deal with lots of duplicated emails, but removing them can be a very time consuming task, if done manually. Unfortunately, dealing with Outlook duplicate emails is a common frustration.