Now remove Duplicate emails from OST Files in the easiest way

If you have been a Microsoft Outlook user for a long, your folder must be filled with large data files. In such cases, the folder gets occupied with many

identical MSG files. If you want to know the best way to remove the MSG files then you have come to the right place. In this blog, we have discussed both the manual and the professional way to remove duplicate MSG Files. The Sysinfo MSG Duplicate Remover is the most efficient and time-consuming way of solving the problem. It is easy to use and has a very user-friendly GUI. 


OST (Offline Storage Table) files are offline copies of Exchange mailboxes used by Microsoft Outlook. They enable users to access synchronized mailbox data locally, allowing offline access and automatic synchronization with the Exchange server when online. This feature is beneficial for users who need constant access to their emails and other Exchange-related information. 

Some businesses have large amounts of data in their Microsoft Outlook. The data contains very important information which is useful for the organization. But sometimes there are very duplicate OST files in the folder. These files create confusion for the user. So, it is important to remove them from the system. 

If you will do this one by one, it will take a lot of time. there are easy ways to do it but before going to the methods of removal.

Let us just check the reason for duplicate OST files.

Reason for Removing the Duplicate emails from OST

The importance of eliminating duplicates becomes evident as they not only affect productivity but also result in larger OST files, increasing the risk of corruption. Manually removing duplicates is a time-consuming and tedious process that can further impact workflow.

  • Frequent IMAP synchronization intervals (less than 15 minutes)
  • Corrupted Outlook profiles causing synchronization issues
  • Unstable network connections.
  • Accessing multiple mailboxes within a single Outlook instance.
  • Interference from antivirus or security software.
  • Bugs or glitches within the Outlook application.
  • Errors during the migration of emails.

Not only these but there can be other reasons also of Outlook is Sending Duplicate Emails.

How to remove the duplicate items on Outlook Manually?

Duplicate items in Outlook OST files can occur due to factors like a weak internet connection, using multiple mailboxes, or encountering problems within Outlook. Removing these duplicates is essential because they consume valuable storage space, potentially hindering mailbox efficiency. Additionally, duplicates can lead to performance issues, errors, and even corruption of the OST file. Below are some ways in which you can check for duplicate files.

Check Configuration

Ensure that your Outlook rules are set up accurately. Incorrect configurations can lead to confusion in email folders. Correctly configuring rules is essential for the immediate removal of duplicate emails. Additionally, confirm that only one instance of the Outlook application is active. Close any extra instances of Outlook.exe through the Task Manager on your system to smoothen the process.

Select “Do not Import Duplicate Items” while importing Outlook items

When importing items such as mailbox folders or contacts from an Outlook PST file using the Import/Export feature within the Outlook application, it’s crucial to choose the “Do Not Import Duplicate Items” option after the import process. This selection helps prevent the inclusion of duplicate items in the application, ensuring a clean and organized import.

Clean the Inbox 

Organize Your Inbox

Outlook offers various tools and add-ins to simplify the removal of duplicate emails. Follow these steps to tidy up your mailbox and eliminate duplicates in Outlook:

  1. Launch Outlook.
  2. Choose a mailbox folder.
  3. Navigate to Home > Cleanup.
  4. Configure the following options:
  5. Clean up Conversation removes duplicate emails within a conversation.
  6. Clean Up Folder removes duplicates from a specific folder.
  7. Clean Up Folders and Subfolders organizes duplicate folders and subfolders.
  8. Right-click the Deleted Items folder and select “Empty Folder” to permanently delete emails, completing the cleanup process.

Professional method to Remove duplicate Emails in OST Files

When seeking an effective solution to eliminating duplicate emails from Outlook OST files, Sysinfo MSG Duplicate remover is the best solution. This tool automatically removes duplicate emails from your Outlook OST Folder. The Folder is usually filled with many files, if you want to remove the identical messages based on To, From, and CC  you can select the option provided by the tool. You can use the tool to remove files across multiple MSG folders at once. The tool allows you to choose the file format of the resultant file. It provides the option of many File formats eg. PST, PDF, MSG, and MBOX. The PDF format is most commonly chosen. 


  1. Search and download the tool from the SysInfo Tools’ website.
  2. Install and launch the tool with administrator access.
  3. Choose “Try Demo” and select the file or folder to scan for duplicates.
  4. Preview and confirm the selection, then choose the output format (e.g., PDF).
  5. Configure removal options like basis, attachments, and date range.
  6. Click “Start Process” to initiate duplicate removal, review the Log Report, and confirm completion.

Conclusion :

In this blog, we have discussed methods to remove duplicate MSG entries from OST files. We have discussed both the manual and professional ways of solving the problem. The Sysinfo MSG duplicate Remover can simplify the process, making it less complicated and more effective. The tool provides 24/7  support if you want any help regarding the working of the tool. You can download the tool from the official website. For the trial, you can use the demo version of the tool which converts only 50 emails per folder. Later you can download the tool to enjoy all its premium features. 

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