Free Outlook OST Viewer tool is an admirable application which helps in previewing OST file without Outlook & Exchange Server. The Free Outlook OST Viewer supports Password Protected, Offline and Corrutped OST file format. The Advance Search of the Free Outlook OST Viewer helps in Searching Mails of OST file using specific email criterias like TO, Subject, From, Recieved On, Recieved Before, Recieved After and Has Attachment etc.