Outlook Duplicate Remover is a free and simple software that helps you move, delete, and remove duplicate contacts. It can look for duplicates across folders and storages. It offers an add-in for Outlook and a standalone Windows application for convenience.

If you need more advanced features, then the paid version is for you. It allows you to select fields to compare, finds duplicates across different folders and storages, and even supports the priority of Outlook folders.
To make things even easier, the software comes with an Outlook add-in that allows you to run the tool right from Outlook. Additionally, a standalone launcher application is included that lets you run the tool without the need to run Outlook.
Overall, this software is a reliable and convenient solution for managing duplicate contacts in Outlook.
Version 4.20: New features and enhancements.
Version 4.19: New features and enhancements.
Version 4.18: New features and enhancements.
Version 4.17: New features and enhancements.
Version 4.16: New features and enhancements.
Version 4.15: New features and enhancements.
Version 4.14: New features and enhancements.
Version 4.13: New features and enhancements.
Version 4.12: New features and enhancements.