Start the SysInfo Add Outlook PST Tool on your system as an administrator.

Click on the Add Files button to browse the PST files on your system to add to the tool.

Moreover, a pop-up shows that the Demo version of the software supports a 10 MB file size.

Select the PST files you want to add and click the Open button to import to the tool.

Now, you can preview the added Outlook PST files in the panel. Also, add more files or remove the ones no longer required.

Here, you can click the Search Files button to browse and search the PST files directly in your system folders.

Click on the Add PST Files button to start the importing process.

Finally, all PST files get added successfully in MS Outlook.