
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 it 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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If you need to move your emails from Outlook (PST) to an email client that supports MBOX format, using a ATS PST to MBOX Converter is the easiest and most reliable option. It allows you to convert PST files into MBOX while preserving emails, attachments, folder hierarchy, and metadata. A good converter also supports large PST files, batch conversion, and works with all Outlook versions. This method avoids manual errors and ensures a smooth transition to clients like Thunderbird, Apple Mail, or Eudora without any data loss.
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The common method to convert to mbox is an indirect way by using the thunder mail. Import the files in the outlook and change the file type by applying the print method.