The PST file is the default data format of Microsoft Outlook, while MBOX is supported by applications like Mozilla Thunderbird, Apple Mail, and other email platforms. Since Outlook does not export directly to MBOX format, a converter tool becomes necessary.
Tools such as MailsDaddy PST to MBOX Converter help users convert PST files to MBOX while preserving emails, attachments, folder hierarchy, and metadata. These tools also support bulk conversion and preview options, making the migration process simple, fast, and secure for users.
Get more info:
https://www.mailsdaddy.com/outlook-pst-to-mbox-converter/