How to Remove Duplicate Emails in Outlook in Easy Steps

Written By Addy Wang
Updated on January 22nd, 2025

Have you opened your Outlook inbox and noticed that the same emails appear multiple times? It’s a common issue that can happen for various reasons like encountering glitches while importing emails from other platforms. Fortunately, there are several methods available to fix this issue. Check out this article to remove duplicate emails in Outlook and fix this problem. Ultimately, opt for the direct use of Outlook Deduplication Tool for smooth and reliable output.

Download Now Buynow

Why Delete Duplicate Emails in Outlook?

Before going into the solution first, understand why duplicate emails appear. Some common reasons include:

The wrong configuration of rules in Outlook can create duplicate emails.
Users syncing multiple devices altogether can create duplicates.
Anti-virus software installed for Outlook can create errors and bugs.
Outlook PST file is getting corrupted and creation of similar data backups.

How to Clean up Duplicate Emails in Outlook?

There are two techniques available to remove Outlook duplicates. One is the manual method and the other is the professional method. However, experts suggest directly using the professional method for a smooth and secure process.

Method 1: Manually Remove Duplicate Emails in Outlook

There are various manual methods available to remove duplicates. In this section, we discuss the best methods to perform this operation.

Steps to Remove Duplicate Emails Online Using MS Outlook

Important Note: Use this method when you have a few emails. If you have a larger number of emails then, use the professional method.

Firstly, run the MS Outlook application on your system.
Then, specify the folders where the duplicates are located.
Now, use the Sort option to group similar emails based on To, From, and Subject.
After that, select the duplicate emails and right-click.
Choose the Delete option to delete the duplicate emails.

Steps to Remove Duplicate Emails in Outlook Free Using Import/Export

Outlook provides built-in features to remove duplicates instantly. Follow these steps:

Step 1: Export Without Duplicates

Firstly, run Outlook on your device.
Now, click on File and choose Open & Export.
After that, click on Import/Export and select Export to a File.
Then, choose Outlook Data File (PST) and select the folders.
Finally, choose the Do not export duplicate items option.

Step 2: Import Without Duplicates

Again, open MS Outlook on your system.
Press on the File button and select Open & Export.
Now, select Import/Export and click Import from another program.
After that, click on the Next button and click Import a File.
Then, select the (.pst) file option and hit Next.
Now, select Do not import duplicate and click Next.
Finally, select the folders you export in step 1 and click Finish.

Limitations of the Manual Method

This method generates errors and increases the chance of data loss.
Also, this process is lengthy, complex, and takes too much time.
Require technical knowledge and a good understanding of Outlook.

Method 2: Dedicated Software to Remove Duplicate Emails in Outlook

With this powerful Deduper for Outlook Software, users get more advanced features to remove duplicate emails from Outlook. This tool is designed to remove duplicate emails, calendars, contacts, and tasks from the PST file. Additionally, this tool also provides a preview feature to see the content of the resultant file before saving it. Moreover, use this utility for advanced filters.

Delete duplicate emails based on the Date filter as Start Date & End Date.
Provides a simple GUI for better performance and quick response.
It does not require the installation of MS Outlook to remove duplicates.

Steps to Remove Duplicates

Firstly, launch the Deduper for Outlook tool as an administrator.
Now, select Single File or Multiple Files/Folders to add files. Click Next.
After that, preview and select the Files or Folders and press Next.
Select the criteria to clean up duplicate emails in Outlook.
Then, specify the Path to save the resultant file.
Lastly, click on the Convert button to complete the process.

Conclusion

In the above article, we explained various approaches to remove duplicate emails in Outlook. The manual method is only capable of removing a few duplicate emails. However, when you have a large number of emails then, use the professional method. Moreover, this tool gives a free version to remove duplicates but has some limitations. You can switch from the free version to the full version at any time.

Frequently Asked Questions

Q. How to delete duplicate emails in multiple Outlook PST files?

Ans– Yes, of course! You can delete duplicate emails in multiple Outlook PST files. This tool allows users to remove a large number of emails at once.

Q. Can I remove duplicate emails in MS Outlook?

Ans- Follow the steps to remove duplicate emails in Outlook:
1. Launch the Deduper for Outlook as an administrator.
2. Choose the Single File or Multiple Files/Folders option to add PST.
3. After that, preview and select the Files and click Next.
4. Select the removing criteria and specify the location to save.
5. Lastly, click on Convert to complete the process.

About The Author:

Addy Wang

Addy Wang is a talented content writer with a passion for creating engaging and informative articles. With a keen eye for detail and a strong command of language, Addy has the ability to craft compelling pieces that resonate with readers.