You can simply Import eml to office365, with help of eSoftTools EML to Office 365 Converter. It can import bulk eml files to office 365 at once without wasting too much time. The tool can offer live preview facilities to all users before starting the conversion procedure. It can export any size of eml files without any restriction. The tool can also support all windows and Outlook editions. If you have any doubts regarding this tool. Then you can attempt its free demo pack to check its working performance. You can export initial 25 items from each eml folder to office 365 free of cost.