Read time 10 minutes

Summary: Learn efficient methods for removing duplicate email messages in Outlook 2016 and 2019 with this informative guide. Discover how to streamline your email organization and prevent clutter caused by redundant messages, enhancing your overall email management experience

Have you ever encountered the frustrating issue of email duplication in your Outlook 2016 or 2019 mailbox? If so, you understand the annoyance it can bring. In this blog, we’ll address this problem comprehensively. Let’s begin by exploring the reasons behind the occurrence of duplicate emails in your Outlook.

How can you end up having duplicate emails?

Indeed, duplicate emails can be quite bothersome and lead to various issues. But have you ever wondered how they find their way into your Outlook? What’s behind this inconvenience? Below, we delve into the causes of duplicate email messages in your Outlook 2016 and 2019 accounts:

  • Incorrect Outlook Rules: Mistakes cause the rules to be improperly configured. This, in turn, causes data duplication in the Outlook mailbox.
  • The Send/Receive Intervals are Short: Due to the short frequency of the Inbox updates, the email messages, as well as the mailbox components, cannot synchronize properly. And this, again, leads to data duplication.
  • The Account Setup is Incorrect: The configuration of the same email account multiple-times can be a cause of repeated synchronization of incoming data, which can cause duplication in the mailbox.
  • Mailbox is Improperly Set: If you have incorrectly set the mailbox while creating an account, you might receive the same email message, calendar entries and contacts several times.
  • Usage of Third-Party Antivirus: In case an anti-virus program is set on the machine in which Outlook runs, there is a good possibility that the Send/Receive process gets intercepted.
Instant Solution

Try an automated tool Kernel for Outlook Duplicates Remover to remove, copy, flag or move duplicate items from Outlook mailbox.

Why should one remove duplicate items from Outlook mailbox?

Now, let’s explore the potential impacts that these duplicate emails can have on your daily work. The following points illustrate the issues they may cause:

  • The duplicity of emails has the potentiality of harming your productivity.
  • Duplicate emails can create confusion and cause errors. Can you imagine having to reply more than once to the same mail? I mean, seriously, I’d be like “Yikes”!
  • This duplicity can potentially impact your Outlook client’s loading performance. The more the messages get stored on your computer, the slower is its performance.
  • Another hazard is that the duplicates fill up your Inbox. You will need to delete email in order that you comply with the allocated email storage capacity.

Having said the above, we should proceed to the next part where we learn how to do away with this duplicity issue.

How to remove duplicate emails from Outlook?

To remove duplicate emails, it’s essential to first pinpoint the root cause of the problem. Once identified, you can then employ a suitable solution. Below, we’ve compiled tips to help you eradicate duplicate emails:

  • Check if the Outlook Rules are configured correctly.
  • Since the short frequency of mail server updates causes duplicity in emails, change the frequency level to 15 to 30 minutes, that’ll prevent the duplicity of emails.
  • Microsoft Outlook has plenty of utilities and add-ins that can clean up the duplicate emails. The Clean-up tool is one such an inbuilt feature within the application.clean up the duplicate emails
  • If you’re facing duplicity of emails due to the anti-virus, disable the email-protection.
  • Remove duplicate emails using a third-party Outlook duplicates remover tool. Well, if the above methods don’t work out for good, don’t despair. And why should you? Kernel presents you with Kernel for Outlook Duplicates Remover to help you with the issue of Outlook duplicates.
  • Performs an all-embracing search to find duplicate items in PST folders
  • Removes, flags, moves, or copies duplicate email items as per need
  • Finds out duplicates by date and time, sender or receiver name, etc.
  • Permits you to save duplicate item(s) report in an HTML format
  • Supports all versions of Outlook which include Outlook 2019/2016/2013Outlook Duplicates Remover
Setting inbox update frequency

To counter duplicate removal issues, you can increase the Inbox update frequency with the below steps.

  • Access Outlook & tap on Send/Receive.
  • From the Send/Receive Groups setting, you can set the option “Schedule an automatic send/receive every” to 15 mins and click on Close.Send/Receive Groups

Note: It’s important for users to review their Outlook Rules to ensure correct configuration, as incorrect rules can lead to confusion among different email folders, potentially contributing to the issue of duplicate emails.

If you’re seeking a tool to effectively a href=””>remove duplicate emails in Outlook 2016, consider Kernel for Outlook Duplicates Remover. This reliable software is your ultimate ally in eliminating duplicate emails. Ensure you have Kernel for Outlook Duplicates Remover installed to prevent email duplicity from turning into a nightmare.

Follow the below steps to Remove Duplicate Email Messages in Outlook 2016 & Outlook 2019:

  1. Run Kernel for Outlook Duplicates toolKernel for Outlook Duplicates tool

    The tool’s UI (user-interface) is quite minimal; it has three (3) specific sections as below:

    • Predefined Tasks: You can select/deselect tasks from this section.
    • Add/Remove Tasks: You can create a new task or delete an old one via this section, you can also Export created tasks, and further Import them.
    • Initiate Tasks: Once you select a task, you may initiate the task.
  2. Note: A “Task,” is a set of settings which when initiated will search and address duplicate email messages in all the marked – selected, folder(s) and will either remove or perform the end command specified.

  3. Assign the new task with a name,
  4. Give a relevant task description > click Next,
    task description

  5. Set Standard Mode – for searching duplicate email messages > click Next,Set Standard Mode
  6. Note: Usually, Standard Mode is the one recommended, but in case if you need deep search for finding duplicate items inside your mailbox folders then, you may select Advance Mode.

  7. A window would pop on-screen,
    • In the left, select single or all Outlook accounts,
    • In the right, place mailbox folders as per your search preference > click Next, mailbox folders
  8. Note: Kernel for Outlook Duplicates will search folders as per the precedence is chosen.

  9. Set the time-period to look for email duplicates in a specific time span,Set the time-period
  10. Note: You can select from the predefined time intervals by clicking on the dropdown.
    Select time intervals
    Note: Select Predefined Period is the default one, for more precise search, use Select Time Period Manually, click on Add button, specify Start & End date, click OK.
    Select Predefined Period

  11. Select Move to Deleted Folder > click Next,Move to Deleted Folder
  12. Note:

    1. In this step, select an action for the task you’re creating.
    2. Even if you’ve given the name Delete to your task, it is not necessary to delete the duplicate emails and other mailbox items; you may select other options available.
  13. Select a criterion (filter) for comparison of duplicates,
  14. Select Receiver name(s) or other criteria as you like > click Next,
    Receiver name

    Note: Duplicates comparison criteria can be considered as filters applied for identification of item copies in the mailbox.

  15. Confirm the task configuration > click Finish,finish task configuration
  16. Note: If you note something is not right, you may step back and apply corrections, and then proceed.

  17. You’ve created the Delete task successfully, click OK,Delete task successfully created
  18. Now that the task is created and loaded select Delete_ITEMS task (1),
    Click Run Selected Task (2), Kernel for Outlook Duplicates will start looking for duplicates in the mailbox,Run Selected Task
  19. Note: You can create tasks with different action assigned and select a peculiar task from the same window – as above.

  20. Wait for scanning to complete,Wait for scanning to complete
  21. Note:

    1. Duplicate mailbox item count is marked with red – as shown above.
    2. You can select Save Report for future references.
  22. Click Ok > Finish.Click to finish


In this blog, we delved into the issue of duplicate emails in Outlook, exploring the various reasons behind their occurrence. By shedding light on these causes, we aim to help you avoid practices that lead to duplicate emails. Understanding the importance of removing duplicates is crucial, and we highlighted it for better awareness. We then transitioned to providing the best solutions and methods for removing duplicate emails from Outlook, with Kernel for Outlook Duplicates Remover being a recommended approach. We trust that this blog has guided you towards the right solution for this issue.

Kernel for Outlook Duplicate Remover