Remove Duplicate Emails from PST File Using Top 4 Methods

  Rollins Duke
Rollins Duke   
Published: June 8th, 2026 • 7 Min Read

Looking for a solution to remove duplicate emails from PST file, but don’t know the right process for how it can be done easily. We are using an automatic solution & manual methods to delete duplicate emails from PST file. Manual approach requires a working knowledge of Classic Outlook and its given options. Secondly, these manual ways are time-consuming & prone to human errors.

Smart users prefer a secure, risk-free desktop-based automated solution to get job done professionally. Whether they want to reduce mailbox size, improve Outlook performance, avoid confusion, or to simplify search, an automated solution is mostly chosen by experts. Use of a manual method sometimes fails in maintaining data accuracy. If you still want to use manual workarounds & be prepared to face challenges occurs while using manual approach.

User Query: Hi BitRecover Team, being an Outlook administrator, I have several PST files which have duplicate emails. I want to remove duplicate emails from PST files to get a better performance of Microsoft Outlook. Some of my PST files have approx 50 GB of data so I want to split PST files into small parts while deleting duplicates. I have tried to resolve my problem using the Clean Up feature but this is not effective for me. Do you have any professional software or service to delete duplicate emails in PST according to my choice?

– Rowan Davis, Florida USA

Expert Solution to Remove Duplicate Emails from PST File

Hi Rowan Davis, please don’t take any stress off, we have a complete solution available to manage Outlook PST files. We have an automatic solution that perfectly matches to your query, i.e., Outlook Duplicate Remover by BitRecover and well suitable according to concern. This tool give flexibility to safely remove duplicate emails from PST as per your need by providing advance filters. It’s separate option allow you to set the size for processed PST files like 2 GB, 5 GB, 10 GB, and 20 GB. Using this tool you will easily perform several filtered duplicate removal tasks as mentioned below.

Click on below buttons to download the recommended tool on computer.

Now check out the listed steps below to remove duplicate email in Outlook PST file, using an automatic solution.

How to Delete Duplicate Emails in PST File?

  1. Open the tool on Windows Operating System and click Next.
    open tool and click next
  2. Add PST files in the software GUI using manual and configured Outlook options accordingly.
    choose file option
  3. Select email folders from preview panel where your duplicated emails are stored.
    select pst folders
  4. Choose a preferred mode to find duplicate emails within or across folders, to delete duplicate emails.
    two modes to remove duplicates within and across the folders
  5. Use advance filters to remove duplicate emails from PST file by date, email id, and email subject.
    advance filters
  6. Afterward, click on Browse icon & set “Destination Path” to store processed PST files.
    click on browse button
  7. Click on “Extract” button to remove duplicate emails in Outlook PST file.
    tool started working
  8. Finally, tool automatically open selected “Destination Path” after completion, which makes easy.
    clean files stored location

Benefits of Using Automated Solution

  • Using this tool, users can delete duplicate contacts, tasks, calendars, emails, notes, & journal entries from their Outlook data files.
  • This tool allows user to choose specific folders where their duplicate emails were stored.
  • Tool support with all versions of Outlook & their files, such as PST, OST, & NST, including both ANSI & Unicode formats.
  • Using this utility, users will remove duplicate data within one & across folders, without corruption.

Manual Methods to Remove Duplicate Emails in Outlook PST File

Microsoft Outlook also provides some alternative options to remove duplicate emails from pst file. Here, we are discussing all alternative options which can be helpful in such cases but there is no guarantee for a success rate. You can click on any alternative method and scroll down.

  1. Use Inbuilt Import/ Export Option
  2. Remove Configured Duplicate Accounts
  3. Use Clean Up Folder & Subfolders

1) Import/ Export Option to Delete Duplicate Emails from PST

  1. Run MS Outlook client and select Open & Export > Import/ Export option.
    import export
  2. Select Import from another program or file option and press the Next button.
    import from another program or file
  3. Choose Outlook Data File (.pst) option and click on Next.
    outlook data file
  4. Press the Browse button and choose a PST file from your pc that has duplicate emails.
    browse pst file
  5. Check the Do not import duplicates option and hit on Next to continue.
    do not import duplicates
  6. Select the Finish button to start importing emails with removing duplicates.
    remove duplicate emails from pst file

Note: Once your PST file is imported into Outlook without duplicates, then export it from Outlook if you want to reuse it somewhere else.

2) Check & Remove Configured Duplicate Accounts

Sometimes if Outlook stopped working due to the account settings, then users again set up a previously used email account with Outlook. That becomes the cause for PST duplicates and users may see the same emails twice. Let’s know how to fix them.

  1. Start Microsoft Outlook and select Info > Account Settings as shown in the below figure.
    remove duplicate emails from pst file
  2. Choose Account Settings from the available drop-down options.
    add or remove accounts
  3. If you see a duplicate account is configured then select it and choose the Remove option.
    click on remove button

3) Use Clean Up Folder & Subfolders Option

  1. Run Microsoft Outlook and select an email folder that has duplicates.
  2. Thereafter, select the Home > Clean Up option as shown on the respective screen.
  3. Select the choice option to remove email duplicates such as Clean Up Conversation, Clean Up Folder, and Clean Up Folder & Subfolders.
    choose cleanup folder option
  4. If you choose Clean Up Folder & Subfolders then all redundant messages in the current folder and its subfolders will be moved to the “Trash” folder.
    click on clean up folder
  5. Now click on the Clean Up folder option to continue cleaning the duplicates.
  6. Open the Trash folder and delete redundant emails permanently to get rid of PST email duplicates.

Get Answers to All Your Questions

Que 1: Which is the best technique to remove duplicate emails from PST files?

Ans: We have mentioned all available possible methods to delete duplicate emails from PST files. However, the above-suggested software is best in all conditions as this simple and guaranteed solution.

Que 2: What are the extra benefits of software that are missing in manual approaches?

Ans: The unique features of software are mentioned below:

  • Pre-define the maximum size for resultant PSTs.
  • Remove duplicate emails in PST by date range, email subject, and address.
  • Search duplicate emails within and across the folders.
  • Delete duplicates based on From, To, Cc, Subject, Body, Attachments, and Time.
  • Create PST folders in different international languages for Non-English Outlook.
  • Repair corrupted PST files and get a healthy output without duplicates.
  • Microsoft Outlook installation is not mandatory.

Que 3: Why do duplicate emails accumulate in PST files?

Ans: There are multiple possible reasons for duplicate emails in Outlook PST files:

  • Setup incorrect rules in the Outlook application.
  • Configuration of multiple duplicate email accounts.
  • Error while setup email accounts.
  • Slow internet and antivirus programs.
  • Allow duplicates to be created during import.

Que 4: Can I delete duplicate emails from PST file exported from Outlook 2021?

Ans: Don’t worry! The tool is compatible with PST files of Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 98, and 97. It supports both ANSI and Unicode PST files.

Que 5: What are the benefits to remove duplicate emails in PST files?

Ans: Removing duplicate emails from PST is beneficial because:

  • Free up storage drive space.
  • Increase the performance of Outlook.
  • Avoid search-related confusion.
  • Avoid Outlook corruption due to oversized PST.

Final Thoughts

At the end of this blog on topic, “Remove duplicate emails from PST file.” We have shared four working methods to remove duplicate email in Outlook PST file. In which we used & solved user query with use of an automatic solution. Secondly, we also had shared manual methods for the users who are looking for freeways to delete duplicate emails from PST. We found using manual approaches is time-consuming, prone to human errors, has a risk of accidental original email removal, which is not suitable for any users if who are using Outlook. At this point, using an automated solution is smart option to securely remove duplicate email in Outlook PST file.

Now, it’s up to you which techniques you are going to choose to save your time & efforts for removal of duplicate emails from PST file. Lastly, If you have any other doubts about this problem then feel free to reach out our support team.

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