How to combine small Outlook PST data files into a single PST?
Combining or merging Outlook PST files into a single PST file becomes so easy with GainTools Merge PST Tool.
The first step is to download, install and run Merge PST Tool on your system.

Merge PST Software Interface
Choose File or Folder mode. Then, go to the Browse button and add PST files whom you want to combine.

Browse PST Files
Get the complete preview of list of PST files. You can move the files up and down using Move Up and Move Down buttons.

Preview & View TGZ Files
Hit the Browse button and mention an output location to save the resultant PST files.

Select Destination path
Click on the Merge Now button. This will commence the merging process.

Convert & Save
Your PST files have been successfully combined & saved at your desired location. You can now access your combined PST files from the specified location.