Tenant to Tenant Migration
MailsDaddy Exchange Server Suite is a third-party tool designed to help with various Exchange-related tasks, including migrating mailbox items from one Office 365 tenant to another. The application supports all Windows OS and allows users to migrate single or multiple Exchange Online data to Office 365 or Cross-Tenant. The free demo edition of the software exports 50 items from each folder.
Get more details: https://www.mailsdaddy.com/off....ice-365-to-office-36