Best OST to PST Converter software to transfer ost to pst freeware. Through This software smoothly works to recover ost file and also restore ost file to pst file.  Its tool to export outlook ost items into Office 365 account, pst file, EML, EMLX, MSG, HTML, MHTML, MBOX, VCF, CSV, ICS, Live, Exchange Server, Zimbra, Gmail, Yahoo, and etc.The software is available with a free Demo edition, which migrates only the first 30 items of each folder from the convert OST mailbox.