For users dealing with large MBOX files, use the MacGater MBOX Converter to convert large MBOX files to multiple formats easily. It offers advanced features like date‑range filters, preview functionality, and duplicate‑email exclusion. It can export to multiple file formats such as PST, EML, PDF, MSG, CSV, HTML, DOC, and even import directly to mail servers like Gmail, Office 365, and IMAP accounts. The batch processing and naming conventions options make managing complex exports surprisingly flexible. For anyone migrating, archiving, or distributing mail data on a Mac, this is the best choice.