If you have numerous PST (Outlook Personal Folders) files In your MAC, it gets difficult to manage all of them. By using
Merge PST for Mac, you can merge all PST files into a single file just in a few clicks.
This utility is useful when you have to combine two or more PST files. This tool allows you to merge Outlook PST files into a new PST file. It is a simple PST merge tool that does not require special IT knowledge.
Easy to use and install in our Windows OS. You can also try free demo version to understand the working of the tool.
For more info:
https://www.toolscrunch.com/mac-merge-pst.html