Are you looking for OST file opening instructions without Outlook? Using the OST to PST Converter software from eSoftTools, you can recover OST data from Outlook Offline file. It is an easy procedure for these gadgets. Prior to doing anything further, convert your OST file to the following formats: PST, EML, MBOX, MSG, ICS, Yahoo, Gmail, Office 365, vCard, EMLX, HTML, and 10+. After that, an OST file without Outlook can be opened with ease. A free trial version is also available. You can examine the trial version.