How to Convert OST to MBOX in Bulk – Know Best Solutions

Published On - February 22, 2025 by Nasir Khan | Reading Time: 5 minutes

MBOX is supported by various platforms such as Thunderbird, Apple Mail, SeaMonkey, Google Takeout, etc. If you are planning to switch from MBOX-supported platform to Outlook, you need to convert OST to MBOX. However, this requires a reliable and efficient solution, especially when you have OST files in bulk. Doing this manually involves no cost but is error-prone and involves complex procedures. Therefore, professionals trust using OST to MBOX Converter for accurate conversion capabilities. Explore various solutions further and find the one that best fits your requirements.

Key Differences Between OST and MBOX

Before you convert OST file to MBOX, here is a comparative analysis of both email formats for a better understanding. Know what makes MBOX the preferred choice:

• Developed by MS Outlook, OST is a proprietary format of Outlook. Thus, accessing it can be difficult. On the other hand, MBOX is a generic email format that stores emails in plain text. So, it is widely accessible on various email clients and platforms.
• OST file requires an active Exchange Server and is exclusively compatible with MS Outlook. To import OST into another email platform, it needs conversion to a compatible format. At the same time, MBOX is a more flexible format for storing and sharing emails across different devices.
• If your Outlook profile is damaged or corrupted, OST becomes inaccessible. To retrieve its data later, one needs to use third-party software. This is not the case with MBOX. It is accessible even without network connectivity and is less error-prone.
• Emails in OST files are saved in a structured database format, which can be risky, leading to corruption in certain situations. On the other hand, MBOX files store emails in a single file sequentially, which ultimately reduces the corruption chances.

Both file formats have their advantages and disadvantages. Nevertheless, in some scenarios, OST to MBOX conversion is required.

Why Do Users Convert OST to MBOX?

Here are some scenarios when users need to save OST data to MBOX format:

• When users need to switch from Outlook to an MBOX-supported email client like Apple Mail, Thunderbird, and more.
• If the user loses access to the Exchange server, he/she might need to open OST on other email clients.
• MBOX can also serve as a universal backup for Outlook mailbox data, as it is accessible on multiple platforms.
• To recover data from corrupt or orphaned OST files, OST to MBOX conversion might help.
• Also, if a user moves from Windows-based Outlook set up to any Mac-based email client, this conversion is needed.

Now, let us take a look at different methods.

Trusted Methods to Convert OST Emails to MBOX in Bulk

Converting OST to MBOX files might seem a bit tricky, but with the right method and software, it can be done easily. This involves both a free manual approach and the use of professional software. Evaluate each properly and decide which way to go.

Free Method to Convert OST to MBOX

The manual approach involves the conversion of OST to PST and later importing PST to Thunderbird. This process is free of cost but executed carefully to avoid any data loss. Follow the process given below:

Step 1: Export OST Emails to PST in Outlook

1. Open Microsoft Outlook and navigate to File.
2. Click on Open & Export, then select Import/Export.
3. As the Import and Export Wizard, choose Export to a file > Next.
4. Opt the Outlook Data File (.pst) as the export format.
5. Select the Outlook folders to export and specify a destination to save the PST file.
6. Click on Finish to complete the process of exporting OST to PST.

Step 2: Import PST to Thunderbird Mailbox

1. Launch the Mozilla Thunderbird application > Tools > Import option.
2. Select the option Import from Outlook and click Next.
3. Choose the data type, Mail, and proceed further.
4. From the given options, select Outlook and then click Next.
5. The import process is complete. You will find your Outlook emails in the Local Folders section.

Step 3: Export Emails From Thunderbird to MBOX

1. Exit the Import Wizard and then restart Thunderbird.
2. Next, install the ImportExportTools NG add-on in Thunderbird.
3. Go to Tools > ImportExportTools NG > Export all folders.
4. Choose a destination folder to save the output MBOX file. Click Next.
5. As soon as the process is complete, your emails will be stored in MBOX format.

Please note that this method requires proper installation and configuration of MS Outlook and Thunderbird. Besides there are other limitations of this process as well.

Limitations of Manual Solution

• It may not be an appropriate choice for large OST file conversion.
• Converting attachment files with this process can be difficult.
• In addition, it does not support corrupt or damaged OST files.
• Procedures may vary depending on which Outlook version you use.

Hence, to avoid such circumstances you must prefer a professional approach.

Best Software to Convert OST to MBOX with Attachments

As per experts, Regain OST to MBOX Converter is a more reliable solution. The software is designed specially to convert OST files in bulk. It lets users overcome most of the limitations of manual processes and convert files effortlessly. The software also allows conversion of OST to other file formats such as PST, MSG, PDF, EML, and more. It is a versatile software for all versions of Outlook OST and Windows OS. Other features of the software include:

• It allows the conversion of attachment files with ease.
• One can batch-convert multiple OST files in one go.
• There is no limitation on file size for conversion.
• The software is reliable and secure for all users.
• It requires no technical expertise to operate the software.

Free Download100% Secure Buy NowPrice: $39

Steps to Convert Outlook OST to MBOX File:

1. Download Regain OST to MBOX Converter Software and install it. Run it.
2. Click on Open and browse OST files from your PC. Add them to the tool.
3. Preview all added OST files, emails, and attachments and select folders.
4. To save OST to MBOX, click on Export and choose MBOX saving format.
5. Define the location to save output MBOX, and click on Convert Now.

Conclusion

There are various reasons why users need to convert OST to MBOX, including backup and archive purposes. The manual solution includes using MS Outlook and Thunderbird applications and is free of cost. If you want to avoid complex procedures and any data loss, using Regain OST File Converter is the best choice. It is efficient software and involves no risk of losing data. Rest, as per the need for conversion, make a wise decision.

Frequently Asked Questions

Q. How do I convert an OST file to PST?

Ans– Converting OST to PST involves using the Outlook Import/Export feature. Do as follows:

1. Launch Outlook > Open File.
2. Click on Open & Export > Import/Export.
3. Choose Export to a file > then Outlook Data File (.pst).
4. Select mailbox folders > Specify save location > Click Finish.

Another solution for OST to MBOX conversion is using the Regain OST Converter Tool. It is a direct solution for a hassle-free experience.

Q. Which is the Best Software to Convert OST Files?

Ans– Professionals suggest using the Regain OST File Converter Tool for secure and quick conversion. It supports the conversion of orphaned OST files and does not require a connection with the Exchange Server. It maintains data integrity and originality of attachments after conversion. Also, it is compatible to work on all versions of Windows Operating systems.