MailsDaddy Free PST Viewer is a reliable PST file reader for Windows users. It helps you access Outlook PST data without configuring any Outlook profile and maintains the original folder structure while viewing mailbox items.
using KDETools Free PST Viewer tool is a advance PST reader solution to access Outlook PST mailbox data and view all folders stricture without configuration Outlook. Its allow to preview of all PST mailbox items and save it another file format with all database.
You can try to free: PST Converter Tool to Convert PST to 25+ formats