To eliminate duplicates in Microsoft Outlook, start by manually reviewing folders like Inbox and Sent Items. Sort emails by subject or sender to spot duplicates easily. Use the built-in search feature to identify recurring contacts and tasks. However, for a more efficient solution, consider the Regain Outlook Duplicate Remover Tool. This powerful utility allows users to easily remove all duplicate emails, contacts, calendars, and tasks effortlessly. With support for multiple PST files and a user-friendly interface, it’s the ideal choice for maintaining a clutter-free Outlook experience.