MS Outlook is really one of the amazing application which is used to organize and manage mail accounts on laptops or desktops. There are various version of MS Outlook is used by most of the user which packed with specific features. But among all Outlook 2007 is widely used version from the most of the Outlook users because of it’s highly advanced features. Sometimes, it may possible that you may encounter with various issues while using Outlook where in PST files becomes inaccessible and refuse to show up. It may not open or show PST file on startup of the MS Outlook due to PST file corruption. It may corrupt due to various reasons.