Are you looking for the most effective solution to convert OST to MBOX file format for Thunderbird, Apple Mail or other email clients? If that’s the case, your search is over. In this article, we’ll describe the entire process of converting your Outlook / Exchange OST files to MBOX format. Continue reading to learn more.

After account configuration Outlook creates a default data file OST for storing all user mailbox data. In this file type Outlook save the entire data of users including email, contacts, calendar, and other mailbox data. This OST file work s a replica of a database that is available on IMAP or Exchnage Server.

With these OST files, a user can work in offline mode to access and edit their emails and other items. This file type is beneficial in various cases but the problem with this file format is it is only accessible in Outlook.

As a result, when a user needs to switch from Outlook to another email client user requires to convert OST to MBOX and other file formats.

Also Read:- How to Transfer/Import Outlook OST to Apple Mail Client?

Why Convert OST to MBOX files?

There are various cases where OST to MBOX file conversion becomes helpful users, some of them are:-

  • With MBOX files a user gets the facility to save separate folders with multiple emails and attachments.
  • To create a backup of emails of Outlook profile and for saving emails for future use.
  • OST files are only workable in MS Outlook, on the other hand, MBOX files works by a number of email clients.

Now let’s see what is the best method available to perform OST to MBOX file conversion task.

Quick Solution to Convert OST to MBOX files With Ease

To save Outlook Mail folders from OST as MBOX file user must use automated third-party software. Many utilities for quick OST to MBOX file conversion are available on the internet. The best in all of them is eSoftTools OST Converter Software. This software will allow you directly convert OST to MBOX files for Apple Mail, Thunderbird, and other applications.


How to convert OST to MBOX file using OST Converter Software?

  • On your Windows PC, download and execute the OST Converter Software.
Welcome screen of ost database recovery
  • From the software’s first screen and click the Select OST Button.
  • Choose between single conversion and batch file conversion as your conversion mode and hit on Next.
  • Browse and select OST files from its location and press the Start Scanning button.
  • Load and extract all OST mailbox folders and items by the software.
OST file recovery
  • From the OST file, get an overview of all folders and contents in the preview panel.
OST Mailbox Conversion Preview
  • Select the required folder and subfolders from the OST file and hit on Save OST option from the menubar
  • Now, from the list of conversion choices, choose Export to MBOX option.
  • Then click the Browse button to choose location for saving output MBOX files with Outlook OST mails.
  • Simply click the Convert button in the final step to begin the process of OST to MBOX Conversion.
Export OST

In a very short time, the software will complete the conversion task. After process completion software will show a new window with a confirmation dialogue simply click on OK to close the software.


We’ve covered the simplest and most reliable way to convert Outlook OST files to MBOX format in this write-up. A user can save an infinite number of mail folders from Outlook / Exchange / IMAP OST files to MBOX format using OST Converter software of eSoftTools. Also, this works with a simple and short process by which technical, as well as non-technical persons, can use this tool to convert OST to MBOX files without any difficulty.


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