If you need to convert EML files to PST for use in Microsoft Outlook, you can either import the EML files manually or use a dedicated EML to PST converter.
For a large number of EML files, manual conversion can be time-consuming. BLR EML to PST Converter is a practical option for batch conversion. It can convert multiple EML files into a single PST file while preserving important email properties such as attachments, formatting, sender/recipient details, and folder structure.
The converted PST can then be opened or imported into Outlook for easy access.
If you're dealing with hundreds or thousands of EML files, using a dedicated converter is generally much easier than handling each file individually.