Download Merge PST files software and click on Add PST files that you want to consolidate and make sure that your files are not damaged.
Select the multiple PST files that you need to combine into one PST file and press Open button.
Now you can see that the files have been listed into the software. You can also select the search PST files if do not remember the file location. Click on Next to move forward.
Choose "Merge PST files", "Remove Duplicate" and "Exclude Deleted Items" to get the resultant PST file free of duplicates and deleted files. too from the resultant PST.
Lastly select the destination to save the resultant merged PST file. And click on "Next" to start the merging process.
Press the Ok Button, once the PST merge is successfully completed.