Outlook has its inbuilt utility i.e Scanpst.exe that can’t repair the large PST file. As a result, the user needs to try some alternative tool to repair Outlook PST files. Outlook PST recovery tool is easy to use and can recover severely damaged PST file without any size limitation. I will suggest you to use Stellar Repair for Outlook that has the ability to repair a severely corrupt PST file. You can download the free trial version to scan & preview your recoverable mail items from this link: https://www.stellarinfo.com/article/download-free-scanpst-exe.php