Converting MSG files to MBOX format manually requires using both Outlook and an email client like Thunderbird. You would first need to open each MSG file in Outlook and save it in EML format. Then, import the EML files into Thunderbird and export them as MBOX. This manual process is complex, time-consuming, and requires a good understanding of both email clients. It can also result in incomplete data transfers or formatting issues, especially when dealing with a large volume of files.

Using the MSG Converter simplifies the entire process. This tool allows you to convert MSG files directly to MBOX format, maintaining the original structure, attachments, and metadata, saving time, and ensuring data integrity.