How remove duplicate emails from

Question

How remove duplicate emails from

Anne-Marie Crosby 35

Outlook Inbox shows duplicate emails. How can I remove these from within Microsoft 360 Outlook?

Faery Fu-MSFT 19,876 Reputation points Moderator

2023-07-03T06:04:42.6666667+00:00

Hi @Anne-Marie Crosby ,

Agree with @Priscilla Soares | Escola São Domingos , it is recommended that you sort all emails in your mail folder by subject, received time, sender, and attachments, then manually pick out duplicate emails, and finally delete them. And you can also refer this article: https://www.extendoffice.com/documents/outlook/4044-outlook-delete-duplicate-emails.html#a1

(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Faery Fu-MSFT 19,876 Reputation points Moderator

2023-07-04T08:44:15.15+00:00

Hi @Anne-Marie Crosby ,

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.
Kishan K 15 Reputation points

2024-01-02T19:19:53.8833333+00:00

There is no solution to this issue still!
Enzo James 15 Reputation points

2024-05-23T12:03:08.2033333+00:00

To delete duplicate emails from Outlook under Microsoft 365, utilize the built-in “Clean Up” tool. Here’s how.

·         Open Outlook.

·         Navigate to the folder with the duplicate emails (usually your Inbox).

·         Choose the "Home" tab at the top of the Outlook window.

·         Select the proper option.

1.      "Clean Up Conversation" removes redundant messages from a chat thread.

2.      "Clean Up Folder" Removes useless messages from the specified folder.

3.      "Clean Up Folder & Subfolders": Removes useless messages from the specified folder and its sub folders.

·         Outlook will ask you to confirm the action. To proceed, click "Clean Up Folder".

·         Outlook will eliminate duplicate messages based on the setting you select.

This technique saves your mailbox by deleting unnecessary emails while keeping the original contents. Please check the deleted things before permanently removing them, as the procedure is permanent.
Amos Moses 0 Reputation points

2024-08-30T11:30:47.4933333+00:00

Outlook ignored a rule not to send or receive on and account i have connected and filled my inbox with 2,600 duplicate emails. Luckily I spotted it before it got to 157,210.

Not having automated this is just bad service. It was caused by a software error and should be an easy fix. We are fixing it manually following advice below but a lot have been filed, so it is a lot of guesswork.
Jonathan Schulteis 60 Reputation points

2024-11-13T18:55:47.5133333+00:00

Unfortunately, it seems like the Clean-up tool(s) don't work well at all for duplicate emails. You have very limited options in Settings regarding that. Is there really no other built-in way to remove duplicate emails besides a manual procedure? We have users with thousands of duplicates sometimes and that would take forever to clean up.
Robert Nargang 0 Reputation points

2025-05-31T03:47:32.91+00:00

Here's an "outside the box" suggestion that is completely free and not complicated. Since users cannot search for and delete duplicate messages using either desktop or web-based Outlook, try adding your Microsoft email account to another email client that will give you that functionality. This is how I remove duplicate emails from my accounts.

Download and install the Thunderbird email client - if you don't have it already. Add the extension "Remove Duplicate Messages". Add your email account using IMAP settings so the client syncs with the server. Once your email account is synced, run the extension against any folder. It can also search nested subfolders. Once finished, it will open a window listing all duplicates. You can then delete duplicate emails from there. The changes will sync back to the server.

(I hope this answer doesn't run afoul of the Code of Conduct. This is not meant to promote Thunderbird. I don't use Thunderbird as my primary email client. I suggest this as an alternative since the functionality cannot be found in Outlook or Outlook.com and this is a completely free and easy workaround.)
JJ 0 Reputation points

2025-07-22T19:14:45.9666667+00:00

Yeah this is painful, I think I moved them using outlook.office.com and for some reason they ended up getting duplicated. I've got 10's of GB of duplicated emails. My IT won't let me download anything so there really should be a built in solution for this.

3 answers

Your answer

Faery Fu-MSFT 19,876 Reputation points Moderator

2023-07-03T06:04:42.6666667+00:00

Hi @Anne-Marie Crosby ,

Agree with @Priscilla Soares | Escola São Domingos , it is recommended that you sort all emails in your mail folder by subject, received time, sender, and attachments, then manually pick out duplicate emails, and finally delete them. And you can also refer this article: https://www.extendoffice.com/documents/outlook/4044-outlook-delete-duplicate-emails.html#a1

(Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Faery Fu-MSFT 19,876 Reputation points Moderator

2023-07-04T08:44:15.15+00:00

Hi @Anne-Marie Crosby ,

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well. Thanks for your understanding.
Kishan K 15 Reputation points

2024-01-02T19:19:53.8833333+00:00

There is no solution to this issue still!
Enzo James 15 Reputation points

2024-05-23T12:03:08.2033333+00:00

To delete duplicate emails from Outlook under Microsoft 365, utilize the built-in “Clean Up” tool. Here’s how.

· Open Outlook.

· Navigate to the folder with the duplicate emails (usually your Inbox).

· Choose the "Home" tab at the top of the Outlook window.

· Select the proper option.

1. "Clean Up Conversation" removes redundant messages from a chat thread.

2. "Clean Up Folder" Removes useless messages from the specified folder.

3. "Clean Up Folder & Subfolders": Removes useless messages from the specified folder and its sub folders.

· Outlook will ask you to confirm the action. To proceed, click "Clean Up Folder".

· Outlook will eliminate duplicate messages based on the setting you select.

This technique saves your mailbox by deleting unnecessary emails while keeping the original contents. Please check the deleted things before permanently removing them, as the procedure is permanent.
Amos Moses 0 Reputation points

2024-08-30T11:30:47.4933333+00:00

Outlook ignored a rule not to send or receive on and account i have connected and filled my inbox with 2,600 duplicate emails. Luckily I spotted it before it got to 157,210.

Not having automated this is just bad service. It was caused by a software error and should be an easy fix. We are fixing it manually following advice below but a lot have been filed, so it is a lot of guesswork.
Jonathan Schulteis 60 Reputation points

2024-11-13T18:55:47.5133333+00:00

Unfortunately, it seems like the Clean-up tool(s) don't work well at all for duplicate emails. You have very limited options in Settings regarding that. Is there really no other built-in way to remove duplicate emails besides a manual procedure? We have users with thousands of duplicates sometimes and that would take forever to clean up.
Robert Nargang 0 Reputation points

2025-05-31T03:47:32.91+00:00

Here's an "outside the box" suggestion that is completely free and not complicated. Since users cannot search for and delete duplicate messages using either desktop or web-based Outlook, try adding your Microsoft email account to another email client that will give you that functionality. This is how I remove duplicate emails from my accounts.

Download and install the Thunderbird email client - if you don't have it already. Add the extension "Remove Duplicate Messages". Add your email account using IMAP settings so the client syncs with the server. Once your email account is synced, run the extension against any folder. It can also search nested subfolders. Once finished, it will open a window listing all duplicates. You can then delete duplicate emails from there. The changes will sync back to the server.

(I hope this answer doesn't run afoul of the Code of Conduct. This is not meant to promote Thunderbird. I don't use Thunderbird as my primary email client. I suggest this as an alternative since the functionality cannot be found in Outlook or Outlook.com and this is a completely free and easy workaround.)
JJ 0 Reputation points

2025-07-22T19:14:45.9666667+00:00

Yeah this is painful, I think I moved them using outlook.office.com and for some reason they ended up getting duplicated. I've got 10's of GB of duplicated emails. My IT won't let me download anything so there really should be a built in solution for this.

Answer 1

Priscilla Soares | Escola São Domingos 410

If you're experiencing duplicate emails in your Outlook inbox, you can follow these steps to remove them from within Microsoft 365 Outlook:

Open Outlook on your computer.
Go to the "Mail" tab at the bottom left corner of the Outlook window.
Select the folder where you have the duplicate emails (e.g., "Inbox").
Click on the "View" tab in the ribbon at the top of the window.
In the "Current View" section, click on the "View Settings" button.
The "Advanced View Settings" window will open. Click on the "Filter" button.
In the "Filter" window, make sure the "More Choices" tab is selected.
Check the box next to "Only items with" and select "Unique Subject and Body" from the dropdown menu.
Click "OK" to close the "Filter" window.
Back in the "Advanced View Settings" window, click on the "Columns" button.
In the "Show Columns" window, select "All Mail fields" from the "Select available columns from" dropdown menu.
From the available columns, find and select "Modified" and "Size (KB)" and click "Add" to move them to the "Show these columns in this order" section.
Click "OK" to close the "Show Columns" window.
Back in the "Advanced View Settings" window, click "OK" to apply the changes.
You'll be back in the main Outlook window with the duplicate emails filtered out.
Sort the emails by the "Modified" column by clicking on the column header. This will group the duplicates together.
Review the grouped duplicates and select the ones you want to delete.
Right-click on the selected duplicate emails and choose "Delete" from the context menu.
Confirm the deletion when prompted.

By applying these steps, you should be able to filter and delete duplicate emails from your Outlook inbox within Microsoft 365 Outlook.

Jordan Bauman 40 Reputation points

2023-10-06T16:15:01.9166667+00:00

Do I need to enable that option somehow? I don't have that option for "Only items with:". I only get" "one or more attachments" and "no attachments". Normally, it wouldn't be terrible to manually pick them out, but I created a rule that accidentally copied a lot of emails. So, it will take me a long time to manually remove them.
Richard Hanks 5 Reputation points

2023-11-08T15:53:21.5433333+00:00

This doesn't work (Outlook 365) due to point above.
STANLEY WOOD 5 Reputation points

2024-01-14T23:10:09.3566667+00:00

Does not work on my 365 Outlook because it does not have the option to Check the box next to "Only items with" and select "Unique Subject and Body" from the dropdown menu. But thanks for trying.
STANLEY WOOD 5 Reputation points

2024-02-07T01:55:34.3166667+00:00
Check the box next to "Only items with" and select "Unique Subject and Body" from the dropdown menu. The "unique Subject and Body did not show up under Only items with but had "one or more attachments" or "no attachments"
57291279 40 Reputation points

2024-12-14T21:51:48.73+00:00
The option Only items with "~~Unique Subject and Body~~" Nor Only items which: Does Not Exist in Microsoft® Outlook® for Microsoft 365 MSO (Version 2411 Build 16.0.18227.20002) 64-bit

Answer 2

Hornblower409 7,910

@Priscilla Soares | Escola São Domingos

Outlook does not have an Advanced View "Only items with Unique Subject and Body" filter.

You are causing people to go looking for a solution that does not exist. Edit your answer and provide an actual solution or replace it with "Removed by author".

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Answer 3

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How remove duplicate emails from

3 answers

Outlook does not have an Advanced View "Only items with Unique Subject and Body" filter.

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