PST file corruption has been a common issue nowadays which can be caused by power failures, malware attacks, sudden abruptly cancellation of Outlook client or any other dis functionality of your system which are sometimes unpredictable. Besides, there are two solutions that you can try to repair PST file if your Outlook PST gets corrupt. First, scanpst.exe, the free Inbox Repair tool provided by Microsoft which is built-in repair utility. If Scanpst.exe cannot repair the file, you should try to restore it from backup. If no valid PST Backup is available, you need to use an Outlook Recovery Tool.
See more info at:- http://migrateemails.com/2016/06/28/repair-pst-file/