EML and MSG are two different files format. If you are trying to convert EML file to MSG then  I would like to introduced before you professional's suggested EML to MSG Converter software. It is dedicated tool to retrieve EML files in MSG format including emails, contacts, notes, attachments, journals, calendars, etc. It is capable to convert EML files of all major email clients like Windows Live Mail, Windows Mail, Outlook Express, etc. There is no limitation of file size, You can convert any size of EML file into MSG format. It is professional tool with easy to use interface so that any common users can safely and quickly import EML file to MSG without technical expertise. The software works with all versions of Windows Operating Systems.

For more info- https://www.zooksoftware.com/eml-to-msg/

To exchange EML files to MSG format you need to convert them first because Outlook can't read them directly. You can drag EML files into Outlook but it is not always useful and can cause problems like formatting issues and missing attachments especially when you are converting more than one email. A better and safer way to do this is to use a tool like WholeClear EML to MSG Converter which easily converts single and multiple EML files into MSG format while keeping the original email structure and attachments. The software is simple to use and works with all versions of Outlook.