What is the free tool to convert PST to MBOX? Can Apple Mail open a PST file?

Many users ask: What is the free tool to convert PST to MBOX, and can Apple Mail open a PST file directly? Technically, Apple Mail cannot open a PST file on its own because PST is a Microsoft Outlook data format, while Apple Mail works with MBOX and EML-style mailboxes.
If you need a free way to convert PST to MBOX, the most common option is an indirect method using Thunderbird (free) as a bridge: first import the PST into Outlook, export emails to a format Thunderbird can read (or sync the mailbox via IMAP), then use Thunderbird add-ons or mailbox export options to save data as MBOX. This method can work for small mailboxes but may be time-consuming and requires careful handling to avoid missing folders or attachments.
For a faster and more reliable conversion—especially for large PST files—many users prefer dedicated PST to MBOX converter tools that preserve folder structure, metadata, and attachments with fewer manual steps.
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