Without the right tool, migrating OST files into an Office 365 account might be challenging. When you have numerous OST emails to migrate, manually doing it using Office 365 is not practical. One such reliable solution is the TrustVare OST to Office 365 Converter. Without losing any email information like name, email, phone, or address, this software is intended to reliably migrate many OST files into the Office 365 account. It readily handles single or multiple OST files. Refer: https://www.trustvare.com/ost/office-365/