The best way to learn how to split MBOX file is by using a reliable third-party solution like vsoftawre MBOX Splitter Software. This tool is designed to handle large MBOX files efficiently and allows users to split them into multiple smaller files based on custom preferences. It is user-friendly, works without technical expertise, and preserves email formatting, attachments, and metadata during the splitting process.

Know More - https://www.vsoftware.org/store/mbox-splitter-tool/