Deduper for Outlook - Version 3.12 Deduper - Outlook duplicate remover does exactly as the name suggests, it searches and removes all duplicates; whether that's appointments, contacts, notes, tasks or emails. It can handle thousands of items at one instance, and you have the ability to manually check everything that has been detected, in which you can cancel or remove the item.Deduper completely eliminates the need to manually delete duplicates in favor of a completely automated system for novices and experts - it doesn't matter your skill level, because we combine advanced features with a simple UI.Deduper is the easy way to remove duplicates in Outlook.