If you’re in the middle of a merger or rebranding project and need to migrate mailboxes between Microsoft 365 tenants, don’t even think about manual methods. I tried that once—never again.
Instead, take a look at MailsDaddy’s Cross-Tenant Migration Service. This service saved me countless hours of planning, mapping, and troubleshooting. They provide a seamless and secure migration experience without needing PowerShell scripts or third-party installations.
What stood out? The ability to migrate mailboxes, shared mailboxes, and archives—all with proper folder hierarchy, permissions, and metadata intact. The admin console is user-friendly, and you can monitor the migration progress in real-time.
They also offer a pre-migration checklist, trial migration, and complete post-migration report—exactly what you'd expect from a top-tier enterprise solution.
Here’s the official link:
https://www.mailsdaddy.com/services/cross-tenant-migration.php