Dear Donna Gilson,
Welcome to Microsoft Community.
I understand that you may have a problem with your Outlook .pst file.
May I ask why you want to recover the pst file? What went wrong with it, was it lost or corrupted?
Can you describe the details to me so that I can know what happened.
If you are looking for the pst file, you can refer to the article in the link below for more information about pst file.
Introduction to Outlook Data Files (.pst and .ost) - Microsoft Support
If your pst file is corrupted, you can try the method in the below link to repair it.
Repair Outlook Data Files (.pst and .ost) - Microsoft Support
Looking forward to your reply.
Best Regards,
Jason.YA - MSFT | Microsoft Community Support Specialist