There's no free tool available in the market to repair PST file. Microsoft provides you the Inbox Repair tool, commonly known as the scanpst.exe utility to scan corrupt PST file for errors. It can fix header corruption issues and rebuild the file structure. Refer to this article to know more about the scanpst.exe utility and how to use it - How to Recover Outlook Mailbox from Corrupt PST?
Use Outlook PST Recovery Tool is an excellent tool that can repair even the most severely broken PST file. This software scans corrupt Outlook PST file to recover them and restore all of them into new and accessible Outlook PST file. It recovers each and every detail in your data file such as attachments, emails, contacts, journals, calendar items and notes.
Based on my knowledge, there are two options to repair PST files (i) ScanPST.exe (ii) Third party tool.
Though, you can use scanpst.exe to repair corrupted PST files. But in some cases, the ScanPST.exe does not work properly then you should go with a third party tool like Shoviv Outlook Recovery tool. It has a free trial version and a good technical support team as well.
If your PST file gets damaged due to any reasons so you need to recover the PST data. With the help of ATS PST recovery tool, you can do this with ease. This application allows you to restore your data into new accessible file formats which are EML, MBOX, EMLX, HTML, MSG, vCal, vCard. With the aid of this utility, you can recover your entire data along with emails, draft, task, journals, calendar, contact and attachment without losing any information. It is compatible with all the version of MS Outlook from 97, 98, 2000, 2002, 2003, 2007, 2010, 2013, 2016 up to 2019.
If you don't have any idea to recover the damaged Outlook PST files them you can take help of Outlook PST Repair tool for recover/repair corrupted PST file and all its database like emails, notes, contacts, tasks, journals, and appointments and make a fresh PST file. It gives a free demo version of this applciation which is also available on the given link. Visit here to know more:- https://www.softaken.com/outlook-pst-repair