Best way to convert an MBOX file without losing folders or attachments?

  • July 5, 2026 10:51 PM PDT

    I’m planning to migrate several old MBOX archives collected from different email clients, and finding the right utility has been harder than I expected. Many tools either miss attachments, change folder hierarchy, or struggle with larger files. While researching, I found MacSonik MBOX Converter, and its feature list looks promising, but I’d love to hear from people who have actually used it.

    From what I understand, the software supports MBOX and MBX files from more than 20 email clients, including newer ones like PowerMail, KMail, and Spicebird. That’s useful because my archives come from multiple sources. It also claims to preserve email properties, metadata, and the original folder hierarchy during conversion, which is one of my biggest concerns.

    Another interesting feature is direct migration to email services such as Gmail, Office 365, Yandex Mail, Hotmail, and iCloud instead of exporting to an intermediate format first. It even lets you skip previously migrated emails, which sounds like a practical option if a migration gets interrupted and you need to restart it.

    I also noticed backup-related features like excluding attachments when creating backups and setting recurring backup intervals. Those aren't features I usually see in an MBOX utility, so I'm wondering how well they work in real-world use.

    This post was edited by Rohit Patwa at July 5, 2026 10:52 PM PDT