If you haven't known, Microsoft has had their cross-tenant migration available to move mailboxes from 365 between 365 tenants natively. However, the documentation on it is horrible, and they don't ...

In performing cross-tenant migration, we encountered some steps which could be be automated; hence this script.

Our proven methodology will ensure a successful migration to Exchange Online with minimal disruption ... transition from Google Workspace to Microsoft 365 or merge two existing Microsoft 365 tenants, ...

Microsoft FastTrack assists with migrating email and data to Microsoft 365, at no additional cost for eligible tenants with 500 or more licenses. We provide information that explains the engagement ...