Transfer emails from PST to MBOX without data loss by following a structured, verified process. Start by creating a backup of your PST, then use a reliable conversion method that preserves folder hierarchy, metadata, and attachments for accuracy and integrity.​

Manual method (for small data): configure Outlook with an IMAP account, sync PST mail to the server, then add the same account in Thunderbird and export to MBOX. This works but is slow, complex, and prone to misses on large or rich datasets like inline images or custom folders.​

Best-practice workflow (for most users): use a dedicated PST→MBOX converter that supports batch processing, maintains structure, and doesn’t require Outlook installed. Look for features like preview, selective export, duplicate removal, large file handling, and intact attachments/headers.​

Key safeguards:

• Validate results by spot-checking headers, dates, and attachment counts in MBOX after conversion.​
• Keep conversions offline for sensitive data; avoid free online tools for bulk or confidential mailboxes.​
• Use trial mode first to test fidelity on a sample before running full batches.

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