To recover data from damaged OST file I suggest you OST to PST Converter application that is made up by using the rich algorithm and the best technology. Using It you can export single as well as more than one OST file along with email, draft, task, attachment, notes, sent item, delete item etc. You can see the preview of recovered mailbox along with all the data of OST mailbox. You store your data into several file formats like PST, EMLX, EML, HTML, vCard, MBOX, vCal, and MSG file formats without losing any information. It gives an accurate result according to your requirement.