The Ultimate Guide to Convert OST File to MBOX

MS Outlook stores all its data offline in an OST file, which cannot be accessed without converting it to another file format. For Outlook users who are shifting to Thunderbird, it becomes essential to convert OST to MBOX to migrate all emails seamlessly. In this write-up, we wil discuss how to export OST to MBOX file format without any data loss. For getting complete information, read this article attentively.


When it comes to email management, many users rely on Microsoft Outlook as their primary email client. However, situations may arise where a user needs to access their Outlook data on a different email client, such as Apple Mail or Thunderbird. This can be a challenging task as Outlook uses OST (Offline Storage Table) files to store its data, which are not compatible with other email clients.

In such cases, user start looking for the most effective solution to convert OST files to a compatible format like MBOX (Mailbox). MBOX is a universal file format that can be used by several email clients, making it easier to access your emails on different devices.

But how can you convert OST to MBOX? This process may seem complex at first, but with the right tools and techniques, it can be done with ease. In this article, we will explore the different methods of converting OST to MBOX, including manual methods and advanced software solutions, to help you choose the best approach for your needs.

Manual Way to Convert OST to MBOX

To import OST file to MBOX, first, we need to convert OST file to PST and then convert OST to MBOX. To understand the entire process, perform the below steps.

Step 1: Convert OST to PST

To export OST files to PST format, you can follow the below steps using Microsoft Outlook:

  • Firstly, launch Microsoft Outlook on your system.
  • Then, navigate to the File menu and click on the Open & Export option.
  • After that, select the Import/Export option from the list. 
  • Here, from the Import and Export Wizard, choose the Export to a file option, then click on the Next button to proceed.
  • In the next step, select the Outlook Data File (.pst) option from the export to a file window, and click on the Next button.
  • Afterward, choose the folders that you wish to export, and click on the Next button to proceed.
  • Now, specify a destination path to save the PST file and select the include subfolder checkbox.
  • Finally, click on the Finish button to initiate the export process.
  • Optionally, you can also set a password to protect the exported PST file and click on the OK button to proceed.

Step 2: Import PST to Thunderbird

To import Outlook PST files into Thunderbird, you can follow the below steps:

  • Firstly, launch the Thunderbird application on your system or PC.
  • After that, click on the Thunderbird menu icon to open the menu, and select the Tools option from the list.
  • Then, from the Tools menu, choose the Import tab to initiate the PST file import process.
  • Here, select the Mail items option from the Import wizard, and click on the Next button.
  • Now, choose the file type as Outlook, and click on the Next button to proceed.
  • Afterward, follow the instructions and provide the necessary details to complete the import process.
  • Once the import process is complete, click on the Finish button to finish the process successfully.

After following the above two steps appropriately, you can manually convert OST to MBOX. However, the manual method for converting OST to MBOX can be time-consuming, and there is a risk of data loss or corruption during the conversion process. It is recommended to use a professional solution for a safer and more efficient conversion. In the upcoming section, we will discuss the advanced approach to export OST to MBOX.

Advanced Solution to Convert OST to MBOX

An advanced solution for converting OST to MBOX is to use a professional OST to PST Converter Tool. It provides a safe and efficient way to convert OST files to MBOX format without any data loss or corruption. It also offers various advanced features like batch conversion, selective conversion, and a preview of OST files before conversion, making the conversion process more flexible and customizable. Additionally, the tool is easy to use and provides a user-friendly interface for a great user experience. To evaluate its performance, try its free demo version.


This article provides a comprehensive guide for users who wants to convert OST to MBOX file format. Here, we’ve discussed the complete guide of the manual solutions for converting OST files to MBOX. Additionally, we provide a highly recommended OST to PST Converter tool which offers a direct and efficient option to transfer OST file to MBOX. This tool is user-friendly that eliminates the need for advanced technical knowledge, making it accessible to all users. By following the guidelines outlined in this guide and utilizing a trusted conversion tool, users can confidently perform the conversion process with ease and precision.

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