PST is the file that supports Outlook and is used to keep the data safe. PST is used as the backend of the tool and is used to save the data. Data like inbox, sent items, task, contacts etc are all saved in PST file and if the file gets corrupted then there could be data loss. Once the files faces corruption then there are chances of attributes loss. However, this loss could be avoided using the Utility to Rrepair PST tool.