Using Regain Outlook PST Merger software you can merge multiple Outlook PST files into a single PST file. Follow the below steps to merge multiple Outlook PST files using Regain Outlook PST Merger software:
Launch Regain Outlook PST Merger software.
The Source Outlook PST File home screen of the software appears.
Click File --> Open or click Open button or click Add PST File button to add an Outlook PST file for scanning.
Click Add PST Folder button to add multiple PST files at once.
The added PST files appear in the software interface with complete Outlook PST file path and the file size (in bytes).
The software starts scanning the added Outlook PST files and once completed displays the scanned PST file items in a hierarchical list in Outlook PST Folder List View screen.
In the Select Destination Path screen, click Browse to provide the destination path of the newly-created PST file after merging.
The software starts performing the PST files merging process.
Once the merging is completed, the software displays the success status.
Also, the software opens the folder which you provided as a destination location for the merged PST files.