Use OST Converter to backup Outlook email offline to Office 365 with contacts, calendar and other items without Outlook installation. The software is easy to handle and provides simple working interface so that both home users and professionals can use its steps easily to backup Outlook email offline to Office 365. OST Converter delivers amazing properties that carries out the process with exact formatting, email components and folder structure. Download the application on any Windows OS and backup Outlook email offline to Office 365.