You can convert ost to pst manually and save OST file data to pst file by using outlook ost file converter tool. OST to PST Converter full version tool supports bulk conversion of multiple OST files into PST file at a time. You can also transfer only selective emails or folders from OST file to PST formats. By using its app you can export OST file to Outlook PST file, Office 365 account, Zimbra, OLM, PST, MSG, EML, EMLX, Gmail, vCard, ICS, live exchange server, MBOX, PDF, NSF, and etc. Free Version of this converter tool enables you safely export starting 30emails per folder to PST without any charges.