Do you want to open EML file without Outlook. You can do it with the manual solution but there are some limitations. Right-click on EML file that you want to open and choose Open with Notepad option but you can access only one file at a time. If you have multiple EML files then it is a time-consuming process. You can also access EML files using the Thunderbird email client. So, first of all import EML files in Thunderbird using ImportExportTools. However, with any third-party tool, you can open multiple EML files at once without installing Outlook or any other applications.