If you are looking for the best solution for combining two or more PSTs, I would recommend you to try MailsDaddy PST Merge and Join Tool. This amazing software smoothly and securely combines multiple PST files into a single Outlook PST format with complete data including emails, contacts, calendars and tasks. It supports both ANSI as well as Unicode PST formats. This PST merge tool works with password-protected and damaged Outlook PST files as well. It is compatible with all Outlook versions like 2019, 2016, 2013, 2010, 2007 and all older versions. This software provides a demo version, download and install and check the features of the software.