If you work with enterprise email, you’ve faced the dilemma: a legacy MBOX file from an old Unix server, Thunderbird backup, or Google Takeout export… and you need it in Microsoft Outlook’s native PST format.
Prioritize the Date: header. Verify after conversion: sort by "Sent" column. Pitfall 3: Folder Depth > 256 Characters Why: PST has a path length limit (including Unicode characters). Deep nested labels from Gmail (e.g., [Gmail]/All Mail/Projects/Archive/2023/Q4/Reports ) truncate silently.
No free script reliably converts MBOX to PST with attachments and folder structures. The format mismatch is too severe. Pay for a tool or pay in engineering hours debugging From_ line splits at 2 AM. Have a war story about a failed MBOX conversion? Share it in the comments – I’ve probably made the same mistake. convert mbox to pst
pst.close()
pypst is incomplete (no attachments, no folder nesting, limited Unicode). Real-world emails break it. If you work with enterprise email, you’ve faced
Use a tool that validates MIME parsing. Test with a known email containing .pdf , .jpg , and .eml attachments. Pitfall 2: Date/Time Corruption Why: MBOX lacks a standard timestamp field. Tools often rely on the From line’s timestamp (which is delivery time, not sent time). Outlook shows wrong sent dates.
import mailbox from pypst import PSTMessage, PSTFile mbox = mailbox.mbox('inbox.mbox') pst = PSTFile('output.pst', 'My PST File') Pitfall 3: Folder Depth > 256 Characters Why:
aid4mail /convert /source="C:\takeout\*.mbox" /dest="C:\output.pst" /mboxStructure=filenameAsFolder /skipDuplicates /pstCompress Pitfall 1: Broken Attachments Why: MBOX stores attachments as base64 chunks inside the body. PST expects attachments as separate objects. If the MIME boundary parser fails, attachments become inline text.