Seamless migration between two O365 tenant

[Marvin Oco]

Scenario:

- 2 tenants contoso.onmicrosoft.com and fabrikam.onmicrosoft.com with AAD connect

- 2 domain forest (contoso.som, fabrikam.com)

- 2000 users in forest contoso.com have 20GB mailbox data each

- need to move all users and mailbox data from forest contoso.com to fabrikam.com (contoso.com will be deleted)

- moved users should still use current SMTP domain contoso.com

What is the best way to address the migration requirement?

[#2]

There's no such thing as seamless when it comes to T2T migration, there's just pain, and more pain :)

Is this only for Exchange content? Do you use any other workloads (SharePoint, Teams, etc) and do you plan to migrate other content? In any case, your best options are to use third-party tools, as Microsoft doesn't offer anything natively.

[#3]

@Vasil Michev also needs to move other workloads like teams, sharepoint and onedrive

[#4]

As vasil Said you would need to use third party toold to migrate all data! There’s a few very good solutions for doing these migrations!

[#5]

We can argue on that part too Adam :) There are solutions alright, but nothing that covers all the intricacies, unless we're speaking for few very basic scenarios.

[#6]

I mean, all scenarios and details , No :) But they are very good at doing what they actually can accomplish! And in a user friendly way