how to Convert OST to office 365 account- To convert OST files to an Office 365 account, use a third-party tool like vartika for Outlook OST to Office 365 converter software, export the OST to Office 365 account, then import the OST into Office 365 via Outlook.

·  Open Outlook with the account associated with the OST file.

·  Go to File > Open & Export > Import/Export.

·  Choose Export to a file and select Outlook Data File (.pst).

·  Choose the folders you want to export and save them as a PST file on your local machine.

https://www.vartikasoftware.com/product/vs-ost-to-office365-converter.html