Smart tool of OST to PST Converter software to convert OST to PST file. The OST to PST Converter Free Software preview the selected Outlook OST files along with transfer data from OST to PST file. You can also split the large size PST files into small bits as per your need. You are free to convert your data into various formats like PST , office 365 account, vCard, vCal, Gmail, live Exchange sever, zimbra, MBOX, EML, EMLX, NSF, HTML, PDF, OLM, and etc.