I wanted to share our positive experience with MailsDaddy’s Cross-Tenant Migration Service for Microsoft 365. We were tasked with migrating over 1,000 user accounts from one M365 tenant to another as part of a global restructuring. The challenge was to do it without disrupting users—and that’s exactly what we achieved.

MailsDaddy’s service allowed us to schedule migrations, map users via CSV, and use advanced filters to control data transfer. Everything—from mailboxes to shared folders—was transferred accurately. Even calendar permissions and folder structures remained intact.

What really stood out was the real-time progress monitoring and automated email status updates, which helped us keep leadership informed throughout the process.

If you’re looking for a reliable, hands-free, and highly customizable migration tool for large-scale tenant migration, you should absolutely consider MailsDaddy.

Here’s their service link: https://www.mailsdaddy.com/services/cross-tenant-migration.php