How to migrate all folders from MBOX file to Outlook or Office 365

Updated on June 18th, 2020

Kuljeet Singh

There was a time when MBOX file format was considered to be the most widely accepted mailbox file format. The primary reason being that it was accessible through multiple clients like Thunderbird, Apple Mail, Entourage, Claws Mail, Netscape, SeaMonkey, Mozilla Mail, Eudora, Evolution, Opera Mail, Mulberry, etc. But with the passage of time, as MS Outlook started gaining prominence because it offered several benefits over other mailbox clients (like improved security and user-friendliness), the PST file format which it supports became the most favored one. The advent of cloud based email management with Office 365 further added to PST format’s popularity and today, several people and organizations seek to convert MBOX files into PST format.

If you’ve been facing such a need, you’re in the right place because in here, we’re going to discuss some of the easiest ways to convert MBOX to PST for exporting mailbox data to Outlook or mbox to Office 365.

Before we begin, you should know that there are both manual and automated methods available for the purpose. Let’s start with the manual method.

Manual Method of Conversion

For this method to work you should have an MBOX client like Thunderbird and also MS Outlook installed on your system.

Step 1: Convert MBOX to Outlook PST

The first step is to convert all MBOX items into PST format. For this, you need to follow the below-given steps:

  1. Launch Mozilla Thunderbird and open the folder that you want to migrate.
  2. Select all the emails of that folder (or only the ones that you want to migrate).
  3. Right-Click on the selected folders and select Save As option from the list.
  4. Browse the location where you want to save the file and click on Save.
  5. Once all the files are saved, Close Mozilla Thunderbird and Open MS Outlook.
  6. Now, create a New Folder and Save it with a new name.
  7. Drag the previously saved files to that newly created folder.
  8. Save the folder in PST file format.

By following these steps, you have successfully converted MBOX files to PST format. You can convert as many folders as you want. After doing this conversion, you need to export that PST file in Office 365.

Step 2: Import PST File into Outlook

In second step, you need to import the created PST file into Outlook through the given steps:

  1. Open MS Outlook and select File.
  • Select Open & Export -> Import/Export.
MBOX file to Outlook or office 365
  • In the Import and Export wizard select Import from another program or file, and then click on ‘Next’.
MBOX file to Outlook or office 365
  • Now, select Outlook Data File (PST) and click on ‘Next’.
  • Select the file to import by clicking on the Browse button; under Options select the suitable option and click ‘Next’.
  • At the end, select Import Items into the current folder and click Finish.
MBOX file to Outlook or office 365

After this, your emails, and all data will be available to view and access in MS Outlook in PST format.

Drawbacks of Manual method

Although the manual methods works and perform the successful transfer of data but it has some drawbacks due to which it is not used normally.

  • This method requires both, Thunderbird and Outlook and won’t work without them.
  • It only transfers emails and no other mailbox items.
  • It only supports Thunderbird MBOX file excluding other email client application files.
  • Data integrity could be on risk.
  • The user is required to have the good technical knowledge to perform these steps.

Automated Method of Conversion

To convert MBOX file to Outlook or Office 365, the most used method is to use a tool to perform the conversion automatically. Such tools help save time and convert more data with more efficiency. There are several free and paid tools available online for this purpose. Next, we are going to tell you the steps to perform the migration with the most trusted tool available online.

Stellar Converter for MBOX‘ software is known for secure transfer of data. To perform the migration, you need to follow the below-listed steps:

  1. The selection of the mail clients is the first step. In this scenario, mail client is Thunderbird. This tool also allows you to choose between other email clients such as Entourage, Apple Mail, etc.
  2. Click ‘Select File’ to select the file for conversion. Alternatively, click Select Identity Folder to convert the contents of an entire folder.
  3. To start the screening process, click on the Convert button.
  4. All scanned results will be displayed in a tree-view list in the software’s left-hand panel. From here you can verify the content of all folders using the preview feature.
  5. Once the preview is done successfully, click on Save As from the file menu and select the output format. You can choose to save the converted file as PST or export to Office 365 directly.
    • If selecting PST, once the file is saved at the desired location, you can import it into Outlook as indicated in the steps described in the manual method.
    • If selecting Office 365, you will be prompted to enter your login credentials for Office 365 after which a secure connection to the server will be made and your data will be saved to your Office 365 account.

At the end of the process, your entire mailbox data including emails, journals, calendars, contacts and more will be exported to Outlook or Office 365, along with all the attachments appended with the emails.

Final Words

There could be several reasons why a user would need to export mailbox data from MBOX to Outlook format or office 365. Regardless of what prompts him to do so, the safest methods to perform the conversion are described above. The automatic method of conversion is quick, very easy and reliable. The user does not need to follow indirect conversions and complicated steps while using a tool. Most importantly, they do not have to deal with cases wherein data is only partially exported. The manual method consists of lengthy, time taking, and complex steps, with chances of partial export and errors. User’s mailbox data is very important, so, to avoid any inconvenience, professionally automatic conversion is generally adopted. We insist on the software by downloading Stellar Converter for Mbox and previewing your Convertable mbox data-free. Try it now!!

About The Author

Eric Simson

Eric Simson is an Email Platform Consultant and is associated with Stellar Data Recovery from last 6 years. He writes about the latest technology tips and provides custom solutions related to MS Outlook, MS Exchange Server, Office 365, and many other Email Clients & Servers. 

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    1. Yes, you can select an identity folder or choose multiple MBOX files and export them to Outlook or Office 365 by using Stellar Converter for MBOX software.

    1. Hi David,
      You can export emails, contacts, calendar entries, notes, deleted items, etc. to Outlook PST by using Stellar Converter for MBOX.

    1. Yes Miracle, Stellar Converter for MBOX allows the filtering of converted emails on the basis of custom date and email addresses. You can include or exclude the mails of a particular date range by specifying under ‘Apply Filter’. You can also exclude mails from the specific email addresses that you don’t want to save.

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