OST Converter Tool, all-in-one-conversion application to import Outlook 2013 OST file to Office 365 user account with emails, contacts and calendar. OST Converter carries simple and handy working environment so that both technical and non-technical can instantly access the application and import Outlook 2013 OST file to Office 365. Outlook email app is not mandatory for importing Outlook 2013 OST emails to Office 365. OST Converter offers numerous features which are easy to access and helps to import Outlook 2013 OST file to Office 365 without data loss.