Import Outlook PST to Postbox Safely: Step-by-Step Process
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Written By
Aaradhya Jain -
Approved By
Shivam Rathore -
Updated on
December 1st, 2025 - Read Time
5 minutes
User Query: “I have old Outlook PST files, and now I’m using PostBox. How can I import Outlook PST to PostBox without losing any emails or attachments?”
Summary: Outlook uses PST files to store emails, contacts, calendars, and other mailbox items. Besides that, PostBox does not read PST files directly. This creates a problem for users who recently shifted from Outlook to PostBox. If you try importing PST files directly into PostBox, the application won’t recognize the format. That’s why users look for a simple method to transfer everything safely without losing formatting, folders, or attachments. In this blog, we will explain easy manual steps and a reliable DRS PST Converter Tool for a quick and hassle-free conversion.
Why Do Users Import PST to PostBox?
- PostBox is lightweight and easier to manage.
- Works well on macOS and Windows.
- Offers fast search, tagging, and message organization.
- Suitable for users who prefer a clean, modern interface.
- Moreover, no heavy configuration is needed.
What You Need Before Importing PST into PostBox
To import PST files to PostBox, you need to convert PST into a format PostBox supports. PostBox accepts: MBOX format and EML format. So the process becomes:
Convert PST → MBOX/EML → Import to PostBox. Let’s explore all available methods.
Method 01: Import Outlook PST to PostBox Using Thunderbird
This is a free method, but it takes time and works only if your PST files open in Outlook. Steps to Follow:
- Firstly, install Mozilla Thunderbird on your system.
- Then, install the ImportExportTools NG add-on.
- Now, open Outlook and configure it with any dummy profile.
- After that, copy your PST emails into this Outlook profile.
- Thunderbird will automatically import the Outlook mailbox.
- Further, export the mailbox from Thunderbird in MBOX format.
- Open PostBox and go to File > Import.
- In the end, choose the MBOX file and complete the import.
Limitations: Manually Convert Outlook PST to PostBox
- Needs Outlook installed and working.
- Takes a lot of time for large PST files.
- Attachments may not import properly.
- Risk of missing folders or damaged emails.
- Also, not suitable for users with no technical knowledge.
Method 02: Reliable Way to Import Outlook PST to PostBox
The easiest way to transfer PST files into PostBox is by using the DRS PST Converter Tool. This tool converts PST files directly into MBOX or EML, which PostBox supports. Designed with a simple and user-friendly interface, every user can easily use it without needing any technical skills. Additionally, this tool offers several advanced features, like Preview, Remove Duplicate, and Date Filter, and more. This tool is highly compatible with all Windows and OS versions. You can also import PST to Google Workspace and other formats, including File and Email Clients.
One-Time PST to PostBox Conversion Service (No Software Needed)
If you don’t want to install any tool, we offer a One-Time PST to PostBox Conversion Service. How It Works:
- You send your PST files securely.
- Our certified team converts them into MBOX/EML.
- You receive clean, ready-to-import files.
- No technical steps, no errors, no data loss.
- 100% private and secure, files are processed offline.
This service is best for users with large PST files or those who want a quick, done-for-you solution.
Simple Steps to Import Outlook Emails from PST to Postbox
- Download and install the DRS PST Converter Tool.
- Now, choose: Select Files or Select folder to add your PST file.
- Then, preview the mailbox folders and choose the emails to export.
- Select MBOX or EML as the output format from the drop-down list.
- Apply advanced features as per your needs.
- In the end, click Convert to start the process.
Real-Life Scenario: Transfer Outlook Emails from PST to Postbox
David shifted from Outlook to PostBox on his new Mac. He had several PST files, but PostBox wouldn’t open them. He tried manual methods, but the formatting kept breaking. Finally, he used the DRS PST Converter Tool to convert his PST files into MBOX. Within minutes, PostBox imported everything perfectly, including folders and attachments.
Conclusion
In this technical blog post, we explored several methods to import Outlook PST to PostBox. The manual method is freely available and is only used to import a few number of PST emails. That’s why it’s highly recommended to use the professional tool. This tool supports batch conversion with several advanced features to make this process more reliable for many users. You can save 50 emails per folder with the demo verison and upgrade to the full version without any restrictions.
Frequently Asked Questions
Ans: The best way is to convert your PST file into MBOX or EML format because PostBox supports only these two formats. Using a professional tool like the DRS PST Converter Tool ensures the conversion is safe, clean, and quick without losing any folders or attachments.
Ans: A tool like the DRS PST Converter Tool is designed to convert PST files into MBOX or EML format, which PostBox can easily import. This tool also maintains the original structure, formatting, and attachments.
Ans: This usually happens when the PST file was converted using an incomplete or manual method. Sometimes attachments get skipped during the Thunderbird import. Using a professional converter ensures all attachments stay linked to the correct emails.
Ans: PostBox does not support the PST file format. PST is an Outlook-specific format, so PostBox cannot read or open it directly. You must convert PST to MBOX or EML before importing.
About The Author:
I, Aaradhya Jain, a technical content writer at DRS Solutions, specializes in delivering clear, practical guides on data management, migration, and recovery tools. With a detail-oriented and user-first approach mindset, I transform complex processes into actionable insights for IT professionals and decision-makers.
