I have been is the same situation a month ago. and had searched for google and got a tool - Outlook PST to PDF Export.
It helped me to export PST to PDF in a very smart way. It has exported all my PST emails into PDF with all email attachments. You can give it a try too. Download the tool from this link - Outlook PST to PDF Export — Print & Export PST Emails into PDF File Format
I know two great software to export PST files into PDF format as following
- Separate PST to PDF Wizard is obtainable in online market at affordable price to change unlimited Outlook PST mailboxes including with attachment and file naming options
- Second option is all in one PST Converter that not only convert PST to PDF format while also offers multiple saving options too with several advanced features
You can choose any software to complete this task professionally
If you neediness to convert Outlook PST to PDF file format then you can go with Outlook to PDF Converter. By using this program you will get the two preferences to save output files. Read and get more information - Software Details