If you want to open and read EML files without installing Microsoft Outlook, you can use a dedicated EML viewer application.
One reliable option is
SysTools EML Viewer Tool, which allows you to view EML emails, attachments, headers, and other message properties without requiring Outlook or any other email client. The software maintains the original email formatting and supports viewing multiple EML files with ease.
For users who need more advanced features,
SysTools EML Viewer Pro and EML Viewer Pro+ are worth considering. These versions provide advanced search and filtering capabilities, making it easier to find specific emails within large EML datasets.
They also offer export options to save EML files in formats such as PDF, MSG, CSV, and PST, which can be useful for email migration, backup, documentation, or sharing purposes.
If your goal is not only to read EML files but also to manage and export them efficiently, the Pro or Pro+ editions are recommended.