How to Convert OST to MBOX Format? Easy Methods

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  • Updated on June 2nd, 2025

Summary:  An OST file helps save and manage Microsoft Outlook data, including emails, contacts, and other data. You can use it to work offline and sync it when you return to stable internet connections with the Exchange server. However, an OST file can be accessed in Outlook for Windows. Therefore, users convert OST to MBOX to access them on numerous popular email clients. 

Now, you will get a native and automated OST Converter Tool for quick results. Before we start, read the reasons for converting OST files into MBOX. 

Convert OST to MBOX Format – Why? 

Once you go through the reasons, you will understand why users save OST to MBOX. These are the benefits of the process. 

  • As OST files open in Outlook only and you want to share them with non-Outlook users, convert OST files to MBOX format. 
  • An MBOX file is ideal for keeping backups, as it can be easily accessed from different email programs. 
  • If you have bulk emails, it will be easier and more convenient to manage them in MBOX format. 

How to Convert OST to MBOX?

Here, we will provide a few different ways to convert OST files into MBOX. Out of all the discussed techniques, you must go through all of them. After that, you will understand which method to choose. Let’s explore the approaches.

#1. Free Technique to Convert OST into MBOX

Since Outlook doesn’t support MBOX files, you have to Convert OST File to PST. After that, import it into an MBOX-supported email client like Thunderbird. 

Step 1: Use Outook: Save OST to PST 

  1. To start, run Outlook and tap File.
  2. Afterwards, hit Open & Export -> press on Import/Export.
  3. Later, select Export to a File (Import/Export) -> Next.
  4. In the next options, pick Outlook Data File(.pst).
  5. After that, tick the folder to export OST to PST.
  6. In the end, assign the path and tap Finish.

Step 2: Import PST Files to Thunderbird

  1. Now, start both email clients: MS Outlook & Mozilla Thunderbird.
  2. Further, hit Tools -> tap Import -> click Mail and Next.
  3. In Source, select OutlookNext.
  4. With these steps, your OST file data will be saved in Thunderbird.
  5. Lastly, press the Finish option.

#2. Convert Outlook OST to MBOX – Automated Way 

CloudXena OST to PST Converter Tool is an advanced utility to end this process within a few simple steps. This software allows users to convert OST to MBOX and other file formats easily. Additionally, you can use it to save single or multiple OST files in one go. Other than this, it offers features such as previewing OST file data before initiating the process. Apart from this, it gives a duplicate remover option and email conversion without attachments, and more. Moreover, the data remains intact during the process. 

Simple Steps to Convert OST to MBOX

Go through all the steps to securely export your OST files into MBOX. 

  1. Firstly, start the OST to PST Converter software on your system. 
  2. Later, hit Select Files or Select Folder to add OST files and tap Next
  3. After that, view and select the item for conversion from OST to MBOX. Tap Next
  4. Then, choose MBOX as the saving option from the Save As option. 
  5. Thereafter, provide the location to keep the output MBOX securely in a system. 
  6. Lastly, press Convert and the process will automatically be initiated. 

Conclusion

Once you read this blog, you might be clear about choosing the right method to convert OST to MBOX. As we have discussed both techniques, you can pick either technique. In case you need a secure and reliable solution, the professional option is best. With this approach, you will be able to end this process in no time without putting in extra effort.

Frequently Asked Questions

Q1. How do I convert OST emails to MBOX directly?

Ans. To do this process, you need Thunderbird and Outlook. After that, follow the given steps. 
1. Firstly, convert OST to PST. 
2. Then, Save PST in Thunderbird. 
3. Lastly, import them to the local drive as MBOX.

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