With the number of users and organizations on Office 365, circumstances will inevitably require some of them to move between tenants.
An Office 365 tenant-to-tenant migration can occur for several reasons, such as after a merger or acquisition or part of a company gets sold. These business events come with complicated legal maneuvers with rigid timelines. Most of these situations require completing tenant-to-tenant migrations on a schedule made by lawyers and executives with little to no regard for the time it takes to move the associated data. It's up to the technical team to work out how to complete the migration and meet their deadline.
Whatever the reason, successfully executing a tenant-to-tenant migration within Office 365 is a complex process with some significant limitations. Let's walk through the process to clarify what's involved with this type of data migration process.