I suggest third-party tool, Atom TechSoft OST to PST Converter. OST to PST Converter very helpful software tool which lightly repairs and recover your damage or corrupt OST file without any data changes or data loss. It gives 100% satisfied result in all situations. I have used many time this application and got complete satisfaction. So, I strongly suggest this utility. This application converts data from Outlook OST file like mail item, calendar, contacts, journals, notes, meeting into PST outlook data formats such as EML, MSG, HTML, MBOX, MHTML, DOC, TXT, PDF, RTF, MS Outlook and PST efficiently without any data change and save it in desire division.