Third-party tool can solve your issue to batch convert Outlook emails to PDF within a few clicks.
Moreover, there is the demo version of the tool using which you can first check the working of the application. It also comes with some advanced features and some of them are listed here for your reference: –
1. Search options are available if you don’t know the exact PST file location.
2. Various export options are also provided for multiple file formats including PST, EML, PDF etc.
3. Search filter for emails based on various attribute like From, To, Bcc, Subject, Sent Date, Received Date etc. are also provided.
4. Feature of Bulk conversions from Outlook Emails and Attachments to PDF is also present.
5. Multiple view nodes for preview messages is also provided. e.g. Normal Mail View, Message Header View, Attachments View, HEX View and many more.