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PSTmortem

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PSTmortem is a Python CLI that exports Microsoft Outlook OST/PST files to Thunderbird mbox or Dovecot Maildir. Designed for very large archives (tested 30 GB+) with low, constant memory. Features folder & date filtering, attachment size limits, resumable Maildir exports, and graceful Ctrl-C.

Python outlook pst ost mbox maildir cli email python3 thunderbird email-migration dovecot libpff

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Apache License 2.0

Created on

June 24, 2026

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