Can I remove duplicate emails in Outlook?

Yes, you can remove duplicate emails in Outlook, but the method depends on how many duplicates you have and where they are stored. Outlook itself does not offer a powerful built-in feature specifically designed to remove duplicate from Outlook automatically. If you only have a few repeated emails, you can manually sort your inbox by subject, sender name, or received date and then delete identical messages one by one. This method works for small mailboxes but can become slow and frustrating if thousands of emails are involved.

For larger mailboxes or multiple PST files, many users choose tools such as SysInfo Outlook Duplicate Remover. This type of software scans PST files, identifies duplicate emails based on selected comparison criteria, and allows you to choose what action to take—such as deleting permanently, moving to another folder, or marking duplicates. It helps save time, reduces mailbox size, and keeps Outlook organized without requiring complex technical steps.