To convert Outlook PST files to PDF manually, you can use the following steps:
Open Microsoft Outlook on your computer.
Select the PST file that you want to convert to PDF.
Click on "File" in the top left corner of the screen.
Select "Open & Export" from the dropdown menu, and then choose "Import/Export".
In the "Import and Export Wizard" window, select "Export to a file" and click on "Next".
Choose "Adobe PDF" as the file type and click on "Next".
Select the folder or account that contains the PST file that you want to export and click on "Next".
Choose a location on your computer where you want to save the exported PDF file and give it a name.
Click on "Finish" to begin the export process.
Once the export process is complete, you should see the PDF file in the location that you specified.