Looking to migrate mailboxes between two Microsoft 365 tenants? This 2025 step-by-step video tutorial walks you through Office 365 Cross-Tenant Mailbox Migration using Microsoft’s native tools. Easily transfer your mailbox data—emails, contacts, calendars, tasks, and more—between tenants with Microsoft 365 Migration Manager.br br With this guide, you’ll perform a smooth Office 365 tenant mailbox migration using only Microsoft’s native method. Note: As of 2025, Microsoft now requires a Cross-Tenant User Data Migration License, assigned either to the source or target mailbox. You’ll also use Windows PowerShell, the Microsoft Azure Portal, and the Microsoft 365 Admin Center to complete essential prerequisites.