PST Tools

PST Tools is a straightforward, yet efficient program that can join together two or more Outlook PST files, as well as to remove duplicate content from them.
The application can handle non-password protected files which are stored in the ‘My Documents -> Outlook Files’ directory, thereby the files you need to process need to be copied in the mentioned folder in order for the program to detect them.
It comes inside a portable package, which works to the user’s advantage, since you can carry it on a removable drive and launch it from there on any computer without it writing to the system registry.
In what appearance is concerned, PST Tools does not impress, sporting rather basic looks. The main window is split into two tabs, one for the merging operation and the other one afferent to the duplicate removal process.
During our tests, the program failed to detect all the files located in the Outlook data folder, which was the first disappointment on the list. In order to merge multiple files, you need to use the Ctrl+Click shortcut if you want to select two or more items, then settle for the output location.
Our second complaint is related to the latter aspect, since the application only provides options to overwrite one of the existent PST files during the merge process, failing to provide the possibility to create a new document. On the other hand, it manages to detect duplicate content inside the PST files, excluding it from the merged output.
The second component, which deals with duplicate message detection and removal can only process one file at a time and overwrites the information during the deletion process.
Everything indicates that you should perform a backup of your PST files before using this utility. It needs improvements in many aspects in order to become a reliable choice.