How to Remove Duplicate Emails in Outlook? Easy Steps

Written By Kiran Sharma
Updated on July 14th, 2025

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David Miller Query:-
“I recently imported a backup PST file into my Outlook account. Now I’m seeing duplicate emails all over my inbox and folders. It makes the email folder hectic and hard to manage. Is there a quick and secure way to remove duplicate emails in Outlook without losing any important messages?”

Introduction:

If you imported a backup file into Outlook and now your inbox is full of duplicate emails. It’s a common issue that can be easily fixed. These duplicates often occur when the same emails are added multiple times during the import. But there are several ways to delete duplicate emails in Outlook. In this blog, we discuss the manual method and a professional Duplicate Remover for Outlook Tool. Each method gives you a quick and reliable solution with no data loss.

Table of Contents

Real-Life Scenario:

John, a marketing executive, recently imported a backup PST file into his Outlook after reinstalling it on his laptop. Soon after, he noticed his inbox and other folders were filled with duplicate emails. This made it hard to manage his messages and slowed down his work. Moreover, he wanted a quick and safe way to remove duplicate emails from Outlook 365 without losing any important emails.

Simple Steps to Remove Duplicate Emails in Outlook

Primary, launch the MigrateEmails Duplicate Remover for Outlook.
Then, choose: Select Files and browse the PST file. Click Next.
Now, preview & select the folder that contains duplicate emails.
Choose the Saving format as PST and apply its advanced features.
Lastly, define the Path to save the resultant file and click Convert.

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Why Is It Important to Remove Duplicate Items in Outlook?

Duplicate emails take up unnecessary space in your Outlook data file.
A clear mailbox folder helps Outlook run quickly without data loss.
Too many similar emails can make it hard to find the correct message.
In addition, removing duplicates helps to maintain a clean inbox.

Manual Way to Remove Duplicate Emails from PST in Outlook

Manual deletion is possible when the number of duplicate emails is small. Here is how you can perform it:

Firstly, open Outlook and go to the folder (Inbox, Sent Items, etc.).
Now, click on View and choose Arrange By. Select Subject or From.
After that, identify duplicate emails by checking the date and content.
Next, hold Ctrl and select duplicates, then delete.
Lastly, empty the Deleted Items folder to permanently remove them.

Important Note: This method is time-consuming and may not be accurate for large mailboxes. These limitations can be hectic. However, you can avoid them easily by using the alternative method explained below.

Dedicated Software to Remove Duplicate Emails in Outlook

For a quick and reliable solution, you can use the reliable MigrateEmails Duplicate Remover for Outlook. This tool is specially designed with advanced technology to handle duplicate emails within a few minutes. It does not require MS Outlook to be installed to remove duplicates. Supports bulk PST files and is compatible with all Outlook versions. Also, this utility has a simple interface, which means tech and non-tech users can easily use it.

Why Remove Duplicate Items from Microsoft Outlook With a Tool?

This tool offers several advanced features to easily remove duplicates without any hassle.

Effortlessly delete all duplicate emails in Outlook.
Preview option to cross-verify the added PST file.

How to Delete All Duplicate Emails in Outlook 365?

Download & install the MigrateEmails Duplicate Remover for Outlook.
Now, choose: Select Files or Select Folder to remove duplicate emails.
Then, you can preview the added PST file for 100% accurate removals.
After that, choose the Saving format as PST from the given list. Select PST.
In the end, apply advanced features & filters. Click Next.

Conclusion

In this technical blog post, there are several methods to remove duplicate emails in Outlook. Removing duplicate emails in Outlook helps you manage your inbox more effectively. It also keeps your system running smoothly and securely. Also, if you choose the manual method or the automated tool, both options help remove duplicate items from Outlook safely. However, for bulk Outlook files, you can use the professional tool. Furthermore, this tool gives you a quick and hassle-free solution with no data loss.

Frequently Asked Questions

Q1. What are the prerequisites before Deleting Duplicate Emails in Outlook?

Ans: Before you begin, make sure to:
– Create a backup of your Outlook data file (PST).
– Close any active sync or third-party Outlook add-ins.
– Make sure your Outlook is updated to the latest version.

Q2. Which is the best tool to Remove Duplicate Emails in Outlook?

Ans: The MigrateEmails Duplicate Remover for Outlook is one of the best tools. It supports both PST and OST files, offers advanced filters, and ensures zero data loss during the process.

About The Author:

Kiran Sharma

I am Kiran Sharma, a Technical Expert in Content writing. I have technical expertise in the field of Email Backup, Data Recovery, and Email Migration, and resolve technical queries related to Cloud Backup or Email Migration for individuals and businesses.