To migrate from Yahoo Mail to Office 365 account quickly & safely, you can trust on the CubexSoft Yahoo Mail Backup software that is useful solution to directly migrate Yahoo Mail messages into Office 365 account. The program can simply migrate emails from Yahoo Mail to O365 with attachments. The utility supports to save Yahoo Mail to O365 with metadata, formatting, images, etc. You can try it that can export 25 emails from Yahoo Mail to Office 365 account at free of cost. It can migrate selective emails from large yahoo mail data into Office 365. https://www.cubexsoft.com/blog/yahoo-emails-to-office-365/