One of the best ways to perform the Yahoo to Office 365 migration is by using a secure and reliable Yahoo Backup Tool. This software approach empowers you to export and migrate Yahoo mails to various other file formats and email clients. Apart from this, it also has some advanced features that will allow users to optimize the whole process by ensuring high data integrity.
In this respect, I have recently used one such utility that I found in an informative article that explains the two different approaches to migrate Yahoo mail to Office 365 mailboxes. This article is well written and precisely explained manual and professional software approaches. You can also refer to this article if you are searching for free or manual methods to migrate your Yahoo mail to Office 365 admin center.