assFixer OST to PST Converter tool is one f the most popular tool for recover deleted and corrupted OST file. It supports converting OST file to PST and different formats like Yahoo, Gmail, MSG, ICS, EMLX. vCard, EML, HTML, Zimbra, MBOX, and Office 360. It easily converts big-size OST to PST. nd give fully accurate results. An additional feature like live preview and the bulk option is also available in this tool. If you want to use it so simply download the free demo version of this tool from the official website of PassFixer.