What is the best tool for extracting emails from Outlook PST files, and how accurate are these tools?

Hi everyone, I'm currently trying to extract a large number of emails (with attachments) from an old Outlook PST file for archiving purposes. I've tried a few free tools, but the formatting often breaks or some emails are skipped. Can anyone recommend a reliable mail extraction tool that maintains the integrity of the data? Also, how accurate are these tools generally when it comes to large files?