I recently collected PST archives from several old computers and external drives. Instead of having one mailbox, I now have multiple PST files that need to be converted into a different format for long-term storage.

Processing each file separately would be time-consuming, particularly because some archives contain thousands of messages. I am looking for a solution that supports batch conversion and makes it easier to manage multiple source files in one workflow.
During my research, I discovered the MacSonik PST Converter Tool. Its batch conversion functionality seems relevant to my requirements because I need to handle several PST archives without repeating the entire process for every file.
I would like to know whether users can add multiple PST files together and select their required export format. Also, does the software provide any option to preview individual mailbox contents before starting the batch process?

I am concerned about maintaining the original folder structure and avoiding accidental data loss when processing several archives.