Remove Duplicate Emails From Outlook 2021, 2019, 2016, 2013

Written By Andrew Jackson
Anuraag Singh
Approved By Anuraag Singh
Published On February 29th, 2024
Reading Time 7 Minutes Reading


Summary– Are you having duplicate emails in your Outlook? If your answer is yes, then you have reached the right place. This blog will let you know how to remove duplicate emails from Outlook. In addition to this, what are all the possible causes of duplicates in Outlook?

In every organization, emails are really important as most of the communication is done via them only. Microsoft Outlook is among the top choices of users when it comes to an email client. Basically, Outlook comes with various advanced features to manage emails efficiently. But, like any other mailbox, Outlook users also suffer from duplicate email issues.

On a daily basis, the number of emails is increasing in our mailboxes. Above this, if there are some duplicates also, the management of email messages becomes a tedious task. Apart from this, it hampers the workflow of users in multiple ways. For example, storage space issues, slowing down Outlook performance, etc. Hence, it is very important to deal with the duplicates so in the upcoming section we are going to discuss the methods to remove duplicate emails from Outlook.

Table of Content

Possible Causes of Duplicates Emails in Outlook

Now, before going towards the solution part let’s find out the causes of duplicate emails in Outlook and why it is very important to remove duplicate emails from Outlook.  So, have a look at the reasons behind the duplicates.

  • Mistakes in Outlook Rules: It might be possible that incorrect rules are configured. This might result in data duplication in the Outlook mailbox.
  • Short Send/Receive Intervals: If the frequency of Inbox updates is set short, the emails and mailbox components will not get synchronized properly. This might also result in data duplication.
  • Incorrect Account Settings: If you have configured the same email account multiple times, then the incoming data will get synchronized again and again. It can also lead to duplicate email messages in the Outlook mailbox.
  • Improper Mailbox Setup: It can also be possible that you have incorrectly set your mailbox while creating an account. Therefore, you might be receiving the same email message, calendar, and contacts again and again.
  • Due to Antivirus: In some cases, even an anti-virus installed on the system can intercept the Send/Receive process of Outlook.

All such reasons make users think twice about how to deal with these duplicates in Outlook. Thus, to make this task easier, multiple ways to remove duplicate emails from Outlook 2019 / 2016 / 2013 and the below versions are covered here.

Quick Tool Tip-  Looking for a simple, reliable, and instant solution to deal with duplicate emails in Outlook? Try Professional Tool , it is totally safe and secure method to remove duplicate emails in Outlook PST/OST/BAK files

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Tips Remove Duplicate Emails From Outlook – Manually 

There are multiple ways to delete duplicate emails from Outlook. You can choose between them as per your cause of duplicates:

Method-1: Remove Duplicate Emails from Outlook Via Import/Export

With the help of the Import/Export feature, you can also remove duplicate email messages in Outlook. Follow the steps mentioned below:

  1. Open Microsoft Outlook and navigate to FileOpen & Export Import/Export option

2. In Import and Export Wizard window, choose Import from another program or file option and click on the Next button

3. Now, choose Outlook Data File (.pst) on Import a file window and click on the Next button

4. On the Import Outlook Data File window, simply Browse the .pst file and check Do not import duplicates option → Next button

5. At last, choose Outlook Data File to export complete data and then on Finish button.

Method-2: Try Clean Up Tool of Outlook to Remove Duplicate Emails from Outlook

Microsoft Outlook has one Clean Up Tool that let you delete duplicated items from the Outlook PST file. To use it in a proper way, follow the steps mentioned below:

  1. First of all, open the MS Outlook application
  2. Then, click on the Clean Up tool from the ribbon bar and expand all the options.
  3. As you expand it, three options will be displayed i.e., Clean Up Conversation, Clean Up Folders, Clean Up Folders & Subfolders
  4. Here, you have to choose Clean Up Folders & Subfolders option
  5. Now, a Clean Up Folder dialog box will pop up, asking you whether to proceed with clean up or cancel? Simply, click on the Clean Up Folder option
  6. After that, click on the Settings option to enter Deleted Items folder location manually
  7. As you click on the Settings, an Outlook Options window will open. Click on the Browse button to add the PST file
  8. Now, the Select Folder pop-up will appear in front of you. Choose Deleted ItemsOK button
  9. Finally, click on the Clean Up Folder option to remove duplicate emails from Outlook mailbox.

Drawbacks of the Manual Method 

All the above-discussed manual solutions are useful only when there is a small size PST file containing only hundreds of emails. But, if you have a large number of emails in Outlook, you might face the following limitations while using manuals.

  • Unable to identify the exact number of duplicates in the Outlook mailbox. So, locating and removing duplicate emails from Outlook via manual solution will not be an option.
  • Clean Up tool starts generating error messages like “No messages were cleaned up. Only messages that satisfy your clean up settings will be moved to the trash folder.” during the duplicate removal process.

Remove Duplicate Emails from MS Outlook Professionally

If a user is looking for a simple solution or wants to avoid the manual solution limitations, go for the professional solution. Outlook Duplicates Remover Tool is one such application that can help you remove duplicate email messages in Outlook.

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The software is designed by keeping all requirements of users in mind. One can find and remove duplicate emails from Outlook by matching particular attributes. For example, subject, to, cc, from, etc. In addition, a user can also delete duplicates from multiple PST files in bulk via Add Folder option. It can be treated as a one-stop solution to fulfill all basic requirements of users. Along with this the tool also offers the facility to remove duplicate attachments from Outlook.

Working of This Tool

  • Download and Install the tool on the local machine.

  • Upload PST file(s) by clicking on “Add File(s)” or “Add Folder” button.

  • Choose between the two options to delete duplicates: Within or Across Folder.

  • Click Change to choose the location to save the resultant PST file.

  • Choose data items, i.e., Emails, Contacts, Calendars, Journals, Tasks, and Notes to remove duplicates.

  • Now, Choose Specify Duplicate Criteria option to specify properties or fields to remove duplicates.

  • The following message appears after process completion. And you are done with the process of removing duplicate emails from Outlook.

Also Read: How to Combine PST Files Without Duplicates Emails?

Time to Wrap Up

Handling duplicates is one of the difficult tasks faced by users. Thus, to make this task easier for the users, multiple ways to remove duplicate emails from Outlook 2021, 2019, 2016, 2013, 2010 PST files are discussed above. This blog will cover all manual and professional solutions for the user. A user can pick between them as per his or her requirements.

Frequently Asked Questions

Can I remove duplicate items in Outlook 2016?

If you want to remove duplicates in Outlook 2016 and other versions either Run the Inbox Clean Up tool or take the help of some third-party tool

Is it possible to delete emails with the same subject in Outlook?

Yes, with the help of this tool, you can delete duplicate emails with the same subject and many other email fields.

Why does my mailbox have duplicate emails?

There are several reasons behind this:

  • Rules are not configured properly
  • Due to antivirus
  • The short interval for Send/Receive
  • Incorrect account setup, etc.
Why removal of duplicates is important in Outlook?
  • Storage space issue
  • Start creating confusion
  • Management of emails becomes difficult
  • Slow performance of Outlook



By Andrew Jackson

I am SQL DBA and SQL Server blogger too. I like to share about SQL Server and the problems related to it as well as their solution and also I do handle database related user queries, server or database maintenance, database management, etc. I love to share my knowledge with SQL Geeks.