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How to delete all duplicate emails from a mail folder in Outlook?

Sometimes, duplicate emails occur in Outlook because of downloading emails repeatedly, copying, importing from PST/CSV files, or other reasons. And this article is going to introduce two solutions to delete all duplicate emails from a mail folder in Outlook.

Quickly search and delete duplicate emails in Outlook

With Kutools for Outlook’s Duplicate Emails feature, you can quickly find and delete them from multiple mail folders, or find and delete all duplicates from the selected ones with two clicks in Outlook. Click for 60-day free trial without limitation!
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arrow blue right bubble Delete all duplicate emails from a mail folder by sorting

This method will guide you to sort all emails in a mail folder by subject, received time, sender, and attachments successively firstly, next manually pick out duplicate emails, and finally delete them. Please follow below steps:

1. In the Mail view, click to open the mail folder that you need to remove duplicate emails from.

2. Click View > Reading Pane > Off to turn off the reading pane. See screenshot:

3. Click View > View Settings to open the Advanced View Settings dialog box.

4. Now in the Advanced View Settings dialog box, please click the Sort button.

5. Then the Sort dialog box comes out. Please select Subject from the Sort items by drop down list, select Received, From, and Attachment from below Then by drop down lists successively, and click the OK button. See screenshot:

6. Click the OK button in the Advanced View Settings dialog box to save the sort settings.
Now it returns to the opening mail folder, and all emails are sorted by subject, received time, sender, and attachments successively.

7. Go ahead to click the From column header to group all emails by senders. See screenshot:

8. Holding the Ctrl key, select duplicate emails one by one manually; and then press the Delete key to remove them. See screenshot:

So far it has removed all duplicate emails in the selected mail folder already.


arrow blue right bubble Delete all duplicate emails from multiple selected ones

In fact, even if you have sorted emails by subject, received time, sender, and attachments, it might be not easy to pick out all duplicate emails manually. This article will introduce Kutools for Outlook’s Duplicate Mails feature, which can quickly remove all duplicate emails with only several clicks.

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1. Open the mail folder, holding Ctrl or Shift keys to select multiple emails, and click Kutools > Duplicate Emails.

2. Now all duplicates among the selected emails are listed and marked with strikethrough. Please click the Delete button.

3. Now a dialog comes out and tells you how many duplicated emails are removed. Please click the Yes button to close it. And then click Finish button to close the Duplicate Emails dialog.


arrow blue right bubble Delete all duplicate emails from multiple mail folders

The Duplicate Emails feature of Kutools for Outlook can also search and remove duplicated emails from multiple mail folders in Outlook. Please do as follows:

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1. Select no more than two emails, and click Kutools > Duplicates Emails.

2. In the Duplicate emails dialog, please check mail folders you will remove duplicated emails from, select Same folder or All selected folders from the Find duplicates in drop down list, and click the Delete button. See screenshot:

3. Now all duplicated emails are listing in the new Duplicate emails dialog. Please click the Delete button.

4. Now a dialog pops out and shows how many duplicated emails are removed. Please click the OK button to close it, and then click the Exit button to close the Duplicate emails dialog.


arrow blue right bubbleDemo: Delete all duplicate emails from multiple selected ones

Tip: In this Video, Kutools tab is added by Kutools for Outlook. If you need it, please click here to have a 60-day free trial without limitation!


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