You can download ost to pst converter tool. Its software is the 100% workable tool  to  convert ost to  pst file. OST to PST Converter by created KDETools software. This outlook ost file converter tool is a best solution to export file/folder from ost to pst outlook format. The tool to convert ost to pst file, Office 365 account, pst file, EML, EMLX, MSG, HTML, MHTML, MBOX, VCF, CSV, ICS, Live, Exchange Server, Zimbra, Gmail, Yahoo, and etc.