pypst is incomplete (no attachments, no folder nesting, limited Unicode). Real-world emails break it.
Only for ASCII-only, no-attachment, single-folder use. Method 2: Thunderbird + ImportExportTools NG + Outlook (Hybrid) Best for: Technical users, one-time migration, preserving folders.
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. convert mbox to pst
Google Takeout MBOX files use "MBOXRD" format (escaped From lines). Many free scripts assume classical MBOX and break. 3. The Conversion Methods: From Scripts to Enterprise Method 1: Python + libpst / pypst (DIY, Free) Best for: Automation, small MBOX files (<500MB), developers.
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. pypst is incomplete (no attachments, no folder nesting,
import mailbox from pypst import PSTMessage, PSTFile mbox = mailbox.mbox('inbox.mbox') pst = PSTFile('output.pst', 'My PST File')
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. Method 2: Thunderbird + ImportExportTools NG + Outlook
| Source | MBOX Origin | Pain Point | |--------|-------------|-------------| | Google Takeout (Gmail) | Takeout/Mail/*.mbox | Folder structure lost if you don't use the right tool | | Mozilla Thunderbird | ImapMail/... (no extension) | Each folder is an MBOX file | | Apple Mail (legacy) | ~/Library/Mail/V5/*.mbox | macOS Sierra and earlier | | Old Unix mail servers | /var/mail/username | Single flat file for all incoming mail |
