To import PST into MBOX format, you can use EmailSoftware's PST to MBOX Converter. This tool offers an easy and efficient way to convert both ANSI and UNICODE PST files into MBOX format. It allows you to create separate MBOX files for each PST file added, ensuring better organization. The tool requires MS Outlook for smooth conversion and supports various email clients like Thunderbird, Entourage, Pocomail, and Apple Mail. With no file size limitations and compatibility with the latest Windows versions, it guarantees a reliable conversion experience.