Converting ost to pst file always needs expert guides as it is the crucial and typical task for exchange & ms outlook users. OST PST conversion totally depends upon situations. The desired resources to accomplish the ost pst job can be used as per these situations: 1- If exchange is available and ost file is opening properly with ms outlook then use Import and Export function of MS outlook. 2- If exchange is not available or ost file is orphan and not opening with ms outlook then use experts suggested application. Many experts are suggested to use PCVITA OST Converter whenever matter of subject is orphan & damaged OST PST conversion without Exchange Server. The application is potent enough to repair corrupt ost, recover deleted data and convert into PST, EML & MSG formats. Read everything here: http://www.pcvita.com/ost-converter.html