If you want to do Export of OST data without any data loss then you can try the free demo version of Vartika OST to PST Converter software. To Recover and transfer OST file into PST Outlook by one of the improvement algorithmic adjusted Software named as OST to PST Converter. You can also see the preview convert before the conversion is actually done. This OST export tool to transfer single/multiple Outlook OST file into various formats like PST Outlook , office 365 account, vCard, vCal, Gmail, live Exchange sever, zimbra, MBOX, EML, EMLX, NSF, HTML, PDF, OLM, and etc.