---- ost to pst converter online is the greatest tool to migration Outlook data from OST file to PST outlook format. This ost converter software to restores all stored emails, contacts, calendars, tasks, notes, journals, etc from the OST file and transfer OST file to PST and other formats like PST, Office 365, Zimbra, EML, EMLX, vCard, vCal, MSG, and MBOX, HTML, PST, Gmail, Live Exchange server, and etc. You can also import all OST file data into your Office 365 account using this software.