I am planning to reorganize some old Outlook mailbox archives and need to convert several PST files as part of the process. The files contain a large amount of email data, including attachments, contacts, calendars, and folders that I would like to preserve. Before I start, I want to understand the safest way to handle the files and avoid unnecessary changes to the original mailbox data.

There are many tools available that are described as a pst converter, but the feature lists can be confusing. I am mainly interested in data preservation rather than simply completing the conversion quickly. For example, I want the folder hierarchy to remain organized and would like to make sure that emails and attachments are transferred correctly.

The number of files is another concern. I have multiple PST archives, and processing each file manually through Outlook could take considerable time. While researching possible solutions, I found the SysInfo PST Converter  and started looking into whether a dedicated application would make this type of task easier.