After trying many methods I got the best solution to convert OST to Office 365 file by using the amazing tool eSoftTools OST to Office 365 Converter tool. This tool convert single as well as multiple files instantly. For the convert OST file to Office 365 users no need to install MS Outlook software on the local disk. If you have a bulk of email data and want to select any one file so you can use the Advanced Email filter option to filter the selected list. You can quickly import your single as well as multiple data into various formats like PST, HTML, MBOX, EML, MSG, Zimbra, Yahoo, Gmail, and Office 365.
Read More:- Convert OST to Office 365