Merge PST tool is used for combining multiple PST file into single PST file, It supports all the version of MS outlook including 2019 & other. The tool also has many features like remove duplicate PST file items while merging into single PST formats & you can also get a free preview for all your PST file before merging into a single file.
You can also try Merge PST Tool to merge multiple PST files in MS-Outlook. It Combines PST files without any duplicates PST items. It Consolidates various PST files such as Emails, Contacts, Calendars, Tasks, Notes, and all. It merges without any duplicates PST files in MS-Outlook. Demo Version is also available. Supports in all Version of Windows and Outlook. Capable in ANSI and also UNICODE formats. Visit here for more info:-https://www.betavare.com/merge-pst/