Use eSoftTools OST to Office 365 Converter to Migrate OST to Office 365 without losing a single email. With this handy and simple OST Converter tool, the user can perform multiple NSF to EML file conversion with the same folder hierarchy, HTML formatting, and text formatting. It extracts all the essential email components like To, Bcc, Cc, Sent, From, Received, Attachments, etc. It is fully compatible with all MS Outlook editions up to 2019.
Get more information from here: Migrate OST to Office 365
Get more information from here: Migrate OST to Office 365