Merge multiple Outlook PST files
Combine Outlook files with all data or selected data with Merge PST Tool in just 4 simple steps. I have used this application a week ago and got fine results therefore, I would like to suggest you to use this application to merge Outlook data files into one PST file. It help you to join PST files without Outlook installation.
Visit here for more info: https://www.osttopstapp.com/pst-merge.html