You can convert EML files into MSG format without losing the email formatting by using the right and reliable tool that offers the feature of preserving the email details after conversion. A lot of tools are available in the market, but it depends on which one suits you better. Trying all the tools is not possible, and it will absorb plenty of time, so I would suggest you try BetaVare EML to MSG Exporter for converting EML files into MSG without losing your data. This software preserves each and every detail of emails, such as formatting, content, attachments, metadata, etc authentically after the conversion. You can learn more about this tool from their website and can try it.