Hi,archiehart,
There are a lot of online resources discussing about how to recovering corrupt or damaged PST files.
First, the Microsoft offical tool scanpst, also called Inbox Repair Tool, can repair the PST file, you can refer the following articles:
http://office.microsoft.com/en-001/outlook-help/repair-outlook-data-files-pst-and-ost-HA010075831.aspx
http://support.microsoft.com/kb/272227
https://support.microsoft.com/kb/287497
Second, there are many third-party Outlook recovery tools you can try, below is a list of them:
https://www.datanumen.com/outlook-repair/compare.htm
Nearly all these tools provide a free trial so you can try first to see if a tool works before purchase it.
Good luck!