Some of the best OST to Office 365 converter software options include OST to Office 365 Migration Tool. Each offers reliable features and user-friendly interfaces. To restore an OST file to Office 365, convert the OST to Office 365 account using a third-party tool, then import the OST files into your Office 365 account using Outlook. https://www.vartikasoftware.com/product/vs-ost-to-office365-converter.html