If you want to perform Office 365 Tenant-to-Tenant Migration then you will go with this informative article Office 365 Tenant To Tenant Migration. Here you will get the most suitable and efficient manual method to migrate the process. However, the manual method is too lengthy and complicated. So, in that case, you can choose an advanced solution Office 365 Migration Tool. The software is the most secure and powerful tool that migrates Office 365 mailbox items, including all the attachments. It can save or backup your Office 365 mailbox to CSV, PST, PDF, DOC, MBOX, MSG, HTML, JSON, etc. They allow you to perform selective migration of the Office 365 mailbox through the mail filter option. To explore the performance you can download it.