To import MBOX files into Foxmail, you can use eSoftTools MBOX Converter software. First, download and install the software. After installation, launch the tool and select the MBOX file you want to import. This software allows you to preview the contents of the MBOX file before conversion. Choose the correct format supported by Foxmail (such as EML), then convert the MBOX file. After conversion, open Foxmail and import the EML files, ensuring that all your emails have been successfully transferred to Foxmail without any data loss.