MailsDaddy PST Merge and Join Tool is a perfect tool to combine multiple Outlook PST file into a single PST. It helps removes duplicate items while merging Outlook PST files. This single wizard application is able to combine password-protected Outlook PST files without any alteration. The utility also helps to merge & join UNICODE, Archive, and ANSI PST files into one UNICODE PST file. It is helpful to consolidate unlimited sizes PST files into a PST file with maintaining folder hierarchy and text formatting.

For more detail: https://www.mailsdaddy.com/pst-merge-and-join/