MSG 重複の削除がなぜ重要なのか?

  武志 雄人
武志 雄人
Published: November 19th, 2025 • 7 Min Read

Duplicate items in MSG files can clog your Outlook folders, slow down the program’s performance, and even take up storage space. This blog will show you how to remove duplicate items from MSG files using traditional methods or with the help of professional tools to organize your Outlook mailbox.

Have you ever opened your Outlook mailbox one day and found multiple copies of the same email? It can be really frustrating, right? These duplicates can cause confusion and make it very difficult to manage your important emails.

Imagine you are looking for an important email from an important client, but you find five duplicate copies of the same email. In this situation, you will need to know how to accurately remove duplicate data from MSG files. Users often ask themselves the following questions:

Question: How do I remove duplicate MSG files from MS Outlook folders?

Answer: You can choose to manually remove duplicate MSG items using the traditional method or use a professional MSG duplicate removal tool for more accurate results.

Question: Is there an easy way to remove duplicate emails from MSG files without losing Outlook data?

A: Of course! The sure way is to use a reliable and professional duplicate removal tool from MSG files, which can remove only the duplicates and leave the other important data intact.

Interpreting the MSG file duplicate issue

Duplicate items most often occur when you import or export MSG files multiple times, when you use multiple email clients, or when a network interruption occurs during the synchronization process. Over time, these duplicate items accumulate and create clutter, leading to storage issues and slow performance of your MS Outlook email program.

Facts worth considering

According to a report submitted by TechJury (2024), the duplicate email problem affects around 25% of MS Outlook users, leading to lost productivity and data management issues. Let’s take a look at when it is important to find a way to remove duplicates from MSG files.

In the real world, this happens

Yuzuki is a marketing executive at a large Japanese company. She noticed that she had around 10,000 MSG files in her MS Outlook backup folder. Many of these files were duplicates from multiple exports. Manually deleting them took hours, but errors still remained. So she turned to a professional MSG duplicate removal tool and removed all the duplicates in minutes, saving her time and ensuring a clean and stress-free email management.

When should you remove duplicates from MSG files?

Here are some situations where you need to act quickly:

  • If you want to import or back up MSG files repeatedly.
  • If you have multiple MS Outlook profiles that tend to sync the same mailbox.
  • When Outlook storage space is running low due to duplicate emails.
  • If you experience issues such as slow Outlook performance.
  • Duplicate emails tend to cause confusion when searching.

The traditional way to remove MSG duplicates

If you only have a few MSG files, you can try the traditional method of deleting duplicate messages as follows:

  1. Try sorting and deleting manually
  • First, open your MSG folder and sort your emails by subject, sender, and date.
    Remove duplicate emails
  • Then try to identify the duplicate emails and delete them manually.
    erase

Strong Points:

  • This is a free method.
  • If you have a small number of files, this process is easy.
  • No external software is required.

Cons:

  • If the folder is large, this process can take a long time.
  • There is a risk of accidentally deleting the original email.
  • It is very difficult to ensure 100% accuracy in such a process.
  1. Try using the Outlook cleanup tool
  • First, go to Outlook’s Home tab → Clean Up → Clean Up Folders.
  • This tool will automatically remove duplicate conversations.

Strong Points:

  • This tool is built into MS Outlook.
  • This tool is easy to use and good for basic cleanup.

Cons:

  • This is not a suitable process for standalone MSG files outside of Outlook.
  • Deep Scan has limited functionality.

Why traditional methods are less effective

  • Manual methods cannot handle large MSG folders.
  • This traditional method can lead to accidental data loss.
  • Such manual methods are not suitable for bulk deletion of duplicate files.
  • There is no preview option to check the duplicate files before deleting them.
  • Such methods lack advanced filtering and sorting capabilities.

Professional tools are the smart choice

MSG files require a professional tool. Enter BitRecover MSG Duplicate Remover ! This smart software auto-scans and removes duplicate MSG files within minutes. This software keeps your Outlook mailbox clean, organized, and error-free, without putting your important email data at risk.

Download Now Purchase Now

Useful features of this smart software:

  • This excellent software will remove duplicate MSG files from multiple folders in bulk.
  • This smart tool allows you to keep either the first copy or the latest copy. Why is removing MSG duplicates important?
  • This software works without having MS Outlook installed on your machine.
  • This tool helps you maintain the folder structure after cleanup.
  • This handy software gives you an instant preview before deletion.
  • This software is compatible with MSG files created by all versions of MS Outlook.
Steps to remove duplicate files from MSG using this tool

Below are the simple steps to use this tool:

  1. First, install and launch the tool.
  2. Then add the MSG files/folders to the panel.
    Select a folder
  3. Then select a destination path to save the cleaned up files.
    Select the destination path
  4. Then select “Remove Duplicates” from the available options.
    Select Remove Duplicates
  5. Finally, start the process and wait a bit until it is completed.
    Start the process
Professional tools are better than traditional methods
standard Traditional Road Professional Tools
Accuracy Moderate expensive
speed slow fast
Data loss High Risk Minimal risk
Batch Processing Not supported Fully supported
Technical skills need Unnecessary
Frequently Asked Questions about How to Remove Duplicates from MSG Files

Q: Is it possible to manually remove duplicate messages from an MSG file without using software?

Answer: Yes! There are manual methods, but they are time-consuming and risky. For accurate data cleanup at scale, it is always better to use a professional tool.

Q: What is the most ideal way to automatically remove duplicate emails?

Answer: You can definitely do this by using a professional tool that can accurately remove duplicates from MSG files.

Q: Does the process of removing duplicates affect the original email data?

A: No! If you use a good professional tool and do it correctly, only the duplicates will be removed and the rest of your data will remain intact.

What’s covered in this blog

This blog has shown you that managing duplicate files in MSG files doesn’t have to be a stressful task. Manual cleanup is effective for small-scale cases, but for complete accuracy, you need to know how to remove duplicate files from MSG files using professional tools.


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