I have been looking for a reliable way to convert Outlook PST files without compromising the original mailbox structure. My main requirements are:

Preserve emails, attachments, folders, and subfolders.
Handle large PST files without frequent crashes or failures.
Maintain the original email properties such as To, Cc, Bcc, dates, and attachments.
Support batch conversion instead of processing every PST file manually.
Provide a preview option before exporting the data.
Avoid depending completely on Outlook during the conversion process.

I initially considered doing the conversion manually through Outlook, but that becomes inconvenient when working with multiple or oversized PST files. There is also a concern that repeated imports and exports may not be the best approach when maintaining the original folder hierarchy is important.

While researching dedicated solutions, I came across SysInfo PST Converter. What caught my attention is that it is designed specifically for PST conversion and provides options for exporting PST data into multiple commonly used formats. The preview functionality is also useful because it allows users to inspect mailbox data before starting the actual conversion.

For anyone dealing with large or multiple PST files, a dedicated PST conversion utility seems more practical than repeatedly importing and exporting through Outlook. I would still recommend testing the free/demo version with a copy of the PST first, especially if the mailbox contains important business emails.