Need to Migrate Between Microsoft 365 Tenants? Try MailsDaddy

[michaelhooper]

If you're facing a Microsoft 365 tenant to tenant migration, don't risk data loss or downtime using outdated tools or complex manual processes. MailsDaddy offers a specialized service to make tenant to tenant migration in Microsoft smooth, secure, and efficient.
With MailsDaddy, you get a fully managed migration that handles mailbox data, calendar items, contacts, and shared mailboxes with 100% accuracy. Their service uses secure OAuth 2.0 authentication and supports incremental syncs — so you can re-run the migration without duplicating data.
Whether you're migrating 10 users or 1,000+, MailsDaddy ensures your transition between Office 365 tenants is handled professionally. It’s an excellent solution for IT teams looking for a hands-free, high-performance approach to Office 365 cross tenant migration.

Free Process:

 

[jameswatt]

I recently had to manage an Office 365 tenant to tenant migration during a company merger, and after comparing several tools, I went with EdbMails—and honestly, it made a huge difference.

At first, I was a bit skeptical because tenant migrations can be tricky. You’ve got user mapping, throttling issues, permission settings, and of course, the pressure to complete everything with zero downtime. But once I installed EdbMails, I found the process much smoother than expected.

What really helped me:

• The tool allows direct tenant to tenant migration, so I didn’t need any intermediate steps or staging environments.
• The automatic mailbox mapping was a life-saver. It matched users between the source and target tenants based on their email addresses. I didn’t have to worry about manual mapping errors.
• I also appreciated the incremental sync. I could perform a pre-migration and then schedule a final cutover later without duplicating data or missing last-minute changes.
• EdbMails preserved everything—folders, permissions, read/unread status, calendars, contacts, you name it. Even my non-technical colleagues were surprised at how seamless the transition was.
• The software uses modern authentication (OAuth 2.0) and complies with Microsoft’s security standards, which was crucial from a compliance point of view.

Performance-wise, I migrated a few hundred mailboxes, including some very large ones (50GB+), and didn’t face any throttling issues. EdbMails automatically handled those limits in the background. Plus, the real-time progress dashboard and detailed reports made it easy to monitor everything and report back to management.

Another plus was the easy-to-use interface. I didn’t have to use PowerShell at all, and the tool walked me through each step.

For anyone facing a similar project—especially mergers, acquisitions, domain changes, or company restructuring—I’d definitely recommend giving EdbMails a try. It saved me a lot of manual effort, kept everything secure, and let us complete the migration without disrupting users at all.

Hope this helps someone out there looking for a reliable way to handle tenant to tenant migration in Office 365. Feel free to ask if you want details on how I structured the actual migration.