5 Ways to Remove Duplicate Outlook Emails

Duplicate Outlook emails not only occupy storage space, but also affect Outlook's performance. This article describes some possible causes of duplicate messages in Outlook and how to delete duplicate Outlook messages .

Outlook is a popular email client that makes communication with customers and colleagues quick and easy. However, it cannot automatically filter and delete duplicate messages. Duplicate messages can take up a lot of storage space, reduce Outlook's performance, and mess up email management.

Why do there are all kinds of duplicate emails in Outlook?

Possible Causes of Duplicate Emails in Outlook

Here are some possible reasons for duplicate messages in Outlook:

• Different Outlook rules are set for the same email, causing the message to be copied to multiple locations.
• Incorrect PST file import can lead to duplicate emails.
• Using the same email account on different devices may result in repeated email sync.
• Inbox updates are low.

After understanding the reasons for the large number of duplicate messages in Outlook, let's see how to delete duplicate messages in Outlook.

How to find and delete duplicate Outlook mail

Method 1. Make sure all rules are correct

As mentioned earlier, setting inappropriate rules for emails is a common cause of duplicate emails. For example, if you set up emails from a specific user to store in multiple folders, this will result in a large number of duplicate emails. To exclude this reason, you need to check your Outlook rules.

Step 1. Open Outlook. You may be interested in this article: [Latest Solution] Outlook is stuck on a configuration file loading in Windows 10.

Step 2. Click File > Manage Rules and Alerts .

Step 3. In the new window, you will see all the rules you created. Select the rules one by one to find the rules that may cause duplicate emails, and then click the underlined value to edit the rule content.

Step 4. Finally, click Apply and OK for the changes to take effect.

Method 2. Schedule automatic sending/receiving

If the interval you set for Outlook to send/receive emails is too short, it may also lead to duplicate emails. Here you can see how to schedule the appropriate automatic send/receive interval.

Step 1. In Outlook, click Send/Receive > Send/Receive Group > Define Send/Receive Group .

Step 2. By default, you can only see one group named All accounts . You can click the New button to create a new account group. Then select the target account group and set the time interval in the automatic send/receive section every XX minutes (the default Outlook send/receive interval is 30 minutes).

Also, make sure to check the check box next to Schedule Automatic Send/Receive every XX minutes .

Step 3. Click Close Exit window.

Method 3. Run the Clean Dialogue tool

Cleanup is a built-in utility in Outlook that helps you find and delete duplicate emails in Outlook. You can follow the steps below to use the Cleanup tool.

Step 1. In Outlook, select the Inbox or another mail folder, and then click the Cleanup icon. From the drop-down menu, select Clean folders or Clean folders and subfolders .

Step 2. In the new window, click Settings . Scroll down to select a folder to store deleted items and configure some other settings from the Cleanup dialog section.

Step 3. Click OK to save the changes.

Step 4. Next, click the Clean Folder option.

For more information about the Clean Conversation tool, you can refer to this page: Use Clean Conversation to delete redundant emails.

Method 4. Set to not import duplicates

If you frequently use the Import feature to import Outlook PST files, it is critical to select the "Don't import duplicates" option during the import process.

Step 1. Click File > Open and Export > Import/Export . Select the import from another program or file option and click Next .

Step 2. Select the Outlook data file (.pst) and click Next .

Step 3. Select the Don't Import Duplicates option and click Next or Finish .

Method 5. Use Outlook Duplicate Remover

The above methods may not be able to find and clean up all Outlook duplicate emails. Another way to delete duplicate Outlook emails is to use a professional free duplicate email deleter, such as Kernel for Outlook Duplicates Remover.

This tool can help you delete duplicate emails in Outlook for free (the trial version can help you delete up to 10 duplicates per folder for free). You can access its official website to install and try it (please download and use it at your own risk).

Please read also:

• How to delete duplicate files on USB drive
• How to find/delete/prevent duplicate files in OneDrive

Summarize

In summary, this article explains several ways to help you remove duplicate Outlook emails. Try the methods listed above.

Additionally, to recover deleted emails or other files, consider using MiniTool Power Data Recovery Free.

If you have found other effective solutions to find duplicate emails in Outlook, you can contact us via [Contact Information].

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