# Install dependencies (Ubuntu/Debian) sudo apt install readpst # contains mbox2pst variant pip install mbox-converter pypst
import mailbox from pypst import PSTMessage, PSTFile mbox = mailbox.mbox('inbox.mbox') pst = PSTFile('output.pst', 'My PST File')
pypst is incomplete (no attachments, no folder nesting, limited Unicode). Real-world emails break it. convert mbox to pst
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. Verify after conversion: sort by "Sent" column
for msg in mbox: pst_msg = PSTMessage() pst_msg.subject = msg['subject'] pst_msg.body = msg.get_payload() # ATTACHMENTS, DATES, FOLDERS are hugely complex. pst.add_message(pst_msg)
On the surface, it sounds simple. In reality, it’s a minefield of character encoding issues, folder structure loss, and attachment corruption. In this post, I’ll dissect the MBOX and PST formats, walk through every conversion method from free scripts to enterprise tools, and give you the battle-tested best practices to avoid data loss. Before converting, you must understand why direct conversion is non-trivial. MBOX (The Line-Delimited Veteran) MBOX is not a single specification but a family of formats (mboxrd, mboxcl, mboxcl2, etc.). The core idea: multiple emails concatenated into one plain text file . No free script reliably converts MBOX to PST
| Tool | Key Feature | Weakness | |------|-------------|-----------| | | Handles 200+ MBOX variants, preserves read/unread flags, categories | $79–$499 | | SysTools MBOX Converter | Direct PST creation without Outlook installed | Slower with huge files | | Stellar Converter for MBOX | Forensic-level metadata preservation | Expensive ($299+) | | Kernel MBOX to PST | Good for corrupt MBOX files | Clunky UI |