To convert PST to MBOX, you have several options, depending on the tools and email clients you're using. Here's a step-by-step guide using both manual and software methods:

Method 1: Using Thunderbird (Manual Method)

1. Install Thunderbird, a free and open-source email client that supports MBOX format.
2. Install the "ImportExportTools NG" add-on in Thunderbird, which allows you to import/export email files in various formats.
3. In Outlook, export your emails as PST files.
4. Open Thunderbird, right-click on your inbox or the folder where you want to import the emails.
5. Choose "ImportExportTools NG" > "Import Messages," and select your PST files.
6. Once imported, you can export the folder as MBOX format.

Method 2: Using a Third-Party PST to MBOX Converter

If you don't want to deal with the manual process, there are dedicated tools that can directly convert PST to MBOX. Many software tools offer this service, some free and others premium. You simply load your PST file into the software, choose MBOX as the output format, and let the tool handle the conversion.

These methods will ensure you successfully convert your emails from PST to MBOX, making them accessible on various email clients that support the MBOX format.

You can simply convert PST to MBOX files. I suggest the ToolsCrunch Mac PST to MBOX Converter Tool is the most reliable software to transfer bulk and large emails from PST to MBOX format without changing the original data. This tool migrates emails and attachments from PST to MBOX files without technical interference. It is compatible with all email clients of MBOX, such as Mozilla Thunderbird and Apple Mail, etc. Users can preview the database before transfer and filter selected data. Use the free demo version for testing.