Import Outlook 2013 OST file to Office 365

How to import Outlook 2013 OST file to Office 365? Use OST Converter Tool and import multiple OST files from Outlook 2013 to Office 365 Exchange Online OWA account with attachments and other attached folder items. Try OST Converter freeware edition on any Windows OS which is available to evaluate and analyse the process to import Outlook 2013 OST file to Office 365.