The most effective way for OST conversions is with the use of eSoftTools OST to PST Converter software and you will get instant or accurate results in this software without any alterations and that will preserve the structure or formatting of OST file data through the conversion. It will repair all the emails, deleted files, documents, attachments, appointments, contact, calendar, journals, tasks, notes, chats, and many more items and that will easily convert all OST items into the PST, HTML, EML, EMLX, MBOX, Yahoo, Gmail, Office365, etc. you also use the demo version of this software from the official websites of eSoftTools.