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+--- Thread: Best MBOX to PST Converter tool in 2026 (Expert Choice)) (/showthread.php?tid=2729)
Best MBOX to PST Converter tool in 2026 (Expert Choice)) - hannabaker - 07-23-2025
If you're trying to move old MBOX emails into Outlook, you'll probably notice pretty quickly that there are dozens of converter tools claiming to do the same job. The difficult part is figuring out which one can handle a real mailbox without changing folders, losing attachments, or creating a messy PST file.
For anyone dealing with Thunderbird, Apple Mail, Google Takeout, or another MBOX-based email archive, I'd focus less on marketing claims and more on a few practical things: folder hierarchy, attachments, email formatting, sender and recipient details, dates, and how the software handles large MBOX files.
There are manual methods available. You can use Thunderbird, export messages as EML, move them into Outlook, and eventually create a PST. That can work for a small mailbox, but once you're dealing with thousands of emails or several folders, it becomes a much more involved process.
Among the tools worth comparing in 2026 are Shoviv MBOX to PST Converter, Stellar Converter for MBOX, and SysTools MBOX Converter.
I found Shoviv MBOX to PST Converter particularly interesting for larger migrations because it supports multiple MBOX files, lets you preview mailbox content before conversion, and offers PST along with several other export formats. It also provides Microsoft 365 and Exchange migration options. According to Shoviv's specifications, its trial version processes the first 50 items in each folder, so you can test your own mailbox before deciding whether the full version makes sense.
Stellar Converter for MBOX is another established option. It supports MBOX files from Thunderbird, Google Takeout, Apple Mail, and various other email clients, so it's also worth putting through the same test.
If you'd rather explore a free, open-source alternative, ContinuMail is worth knowing about. Just keep in mind that its developers currently describe it as an early 0.x release and specifically recommend keeping backups and validating the converted output.
Whatever tool you choose, don't test it on your only copy of the mailbox. Keep the original MBOX files untouched and start with a smaller sample. After conversion, open the PST and compare folder counts, dates, attachments, formatting, and a selection of old and recent messages.
It's also worth checking your Outlook version because PST functionality and requirements can differ between classic and new Outlook. Microsoft provides current guidance on working with PST files in Outlook.
For a larger MBOX-to-PST job, Shoviv looks like a practical option to test, but I wouldn't label one converter as universally best. The safest approach is to run the same sample MBOX through two or three trial versions and compare the PST output yourself.
If you've recently converted a large Thunderbird or Google Takeout MBOX archive, which tool worked best for you? I'd especially like to hear about experiences with very large files and whether the folder structure stayed intact.
Get it from Microsoft App Store: https://apps.microsoft.com/detail/xpdp95x243xn24