You can use one of the remarkable OST to PST Converter Tool that is specially made to solve all OST corruption issues. It is safe to use application that gives lots of features to make OST Conversion process more beneficial for you. By taking help of OST Converter Software you not only convert your OST emails as PST but also convert emails into EML, MSG, HTML, MHTML, RTF, TXT, DOC, PDF, MBOX and outlook profile etc. While conversion, you can split the PST File upto 5 GB to prevent outlook corruption. Messages filtering option helps to recover emails by selecting dates “From date” to “To date”.
Read more- http://www.ost-to-pst.org/