Free Methods to Convert PST to MBOX Files on Mac


“How do I convert PST to MBOX in Thunderbird?” If you are also such a user who has the same query, then you are on the right blog. We will share the complete guide to convert PST to MBOX efficiently on a Mac device. So, stick to the blog, till the end.

The Portable Storage Table or PST file format is supported by Microsoft Outlook. This file format is commonly used by Outlook users and is highly prone to corruption once it reaches a certain size limit. MBOX is a type of file format that stores data in a single file format and is easily accessible in both Mac/Windows OS. As an MBOX file provides more advantages to the users, they want to convert Outlook PST to MBOX. Before we start with the techniques for the conversion of PST files to MBOX, we will share some reasons why users prefer to switch from PST to MBOX.

Reasons to convert PST to MBOX

The reason for transferring from PST file format to MBOX depends on the user’s needs. Here we just have mentioned some of the common reasons.

  • MBOX file format is compatible with all operating systems and easily accessible.
  • PST file reaches the size limit then it can not be accessed and prone to corruption.
  • MBOX follows a sequential manner to store emails and attachments while PST does not.
  • Users can view the MBOX file data offline.

After going through the reasons, it is time to move on to the techniques to convert emails from Outlook PST to MBOX format.

How do I transfer emails from Outlook to Thunderbird?

There are precisely two approaches available to convert PST to MBOX format. We will talk about both manual and professional approaches‌ in this section. The professional method consists of an automated Outlook PST Converter.

#1. Manual Approach to Convert Outlook PST to MBOX

  • Launch MS Outlook on your device.
  • Click on the File option and go to the Import option.
  • Select Outlook data file for window, and click Next.
  • Choose Outlook for the Window data file(.pst) and then click on the right-arrow icon.
  • Go to the location of the PST file and select it.
  • Tap on Import and the PST file will import to the Mac Outlook.
  • Now, Drag and Drop the PST file to your desktop.

To use this manual method, users need to have good technical knowledge. Before proceeding with the manual method, users must check some limitations that come along with this method.

Drawbacks of the Manual Method

Here are some limitations of the manual method to convert Outlook data files to Thunderbird MBOX, which does not make it an optimum solution.

  • Users cannot bulk convert the PST file to MBOX format.
  • Data alteration or deletion can take place.
  • It is not possible to eliminate duplicate emails.
  • There can be difficulty in converting large-sized PST files.

To overcome these limitations, many users prefer using the professional Mac Outlook PST converter.

#2. Automated Method to Convert PST to MBOX

MacSonik PST Converter Tool for Mac is a risk-free and trusted solution to convert Outlook data files to Thunderbird MBOX. This tool allows to batch convert PST files with high data accuracy. This method provides a secure conversion of PST files into MBOX in bulk with or without attachments. Users can also convert Outlook PST files to various file formats and email clients like PDF, MBOX, HTML, Gmail, Thunderbird, Office 365, etc.

Steps to convert emails from Outlook PST to MBOX format

  • Run the MacSonik Outlook PST Converter on your Mac machine.
  • Select Single/Multiple File selection Mode.
  • Add the required PST files by clicking on the Browse button.
  • Check the required folders from the displayed tree structure.
  • Select MBOX as the Saving file format from the drop-down box.
  • Finally, hit the Convert button to initiate the conversion process.

Some Advantages of Mac Outlook PST Converter

  • Bulk conversion of PST files is quickly possible with this method.
  • Users can opt to save the attachments separately.
  • It maintains data originality throughout the conversion process.
  • It prevents the repetition of the same emails.
  • Users can also convert PST files to PDF, HTML, EML, MSG, and many more file formats.


In this blog, we have shared the techniques to convert PST to MBOX along with the reasons. We have shared both manual and professional approaches to performing the conversion. The professional approach is the most opted solution by many experts as it provides 100% accurate results.

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