Individual email messages from Microsoft Outlook PST files can be exported and saved as separated files (often saved as .eml) wither with Outlook itself (you will need to import .pst file first) or with the use of some kind of dedicated Outlook converter.
Convert Microsoft Outlook personal storage table to Email message.
We have found 3 software records in our database eligible for .pst to .eml file format conversion.
Microsoft Windows software - convert pst to eml on Windows
An e-mail management tool distributed with Microsoft Office suite
Convert from pst file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pst to eml. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert pst to eml on OS X
Mac version of the popular e-mail client and personal information manager from Microsoft
Linux/Unix software - convert pst to eml on Linux
An Outlook converter for Linux