OST to office 365 converter is a secure utility to retrieve lost data from orphaned OST file and import ost to office 365 account. ost to office 365 tool absolutely converts OST file, including all relevant folders like Inbox, Outbox, Sent Items, Deleted Items, Draft, Tasks, Journals, Calendars, Notes, and Contacts. Even, recovered OST data can be saved in multiple formats such as Office 365 account, pst file, EML, EMLX, MSG, HTML, MHTML, MBOX, VCF, CSV, ICS, Live, Exchange Server, Zimbra, Gmail, Yahoo, and etc. 

https://kdetools.com/ost/office365/