Migrate OST to Office 365 Account -A good tool for migrating OST files to office 365 accounts is "Vartika software Outlook OST to office 365 Converter software". Easy way to restore outlook ost files in office 365 account. This is the right way to migrate an OST file to an M365 account, first convert the OST to PST using Outlook or a third-party tool. Then, import the PST file into your M365 account via Outlook.
