To convert EML to NSF format without losing the email formatting, you require a tool that allows you to convert EML files into NSF and provides the facility of preserving the email details after conversion. One of the best tools that I know is the OST to PST APP EML to NSF Converter that converts your files seamlessly without losing any data. It preserves the email details such as content, formatting, attachments, metadata, etc, authentically after the conversion. It provides a bulk conversion feature that helps users convert multiple files at once without losing data.