Migrating from one Office 365 tenant to another tenant may be required in mergers, acquisitions, spin-offs, or other similar scenarios. In this blog we will check some key steps to take when performing Office 365 Tenant to Tenant Migration.

Key Steps for Performing the Migration

Performing the migration requires careful planning. The whole process will be carried out in three phases as described below.

Preparation:

• Take a complete inventory of your current Office 365 environment, including users, licenses, groups, and shared resources.

• Identify any dependencies on third-party applications or integrations.

• Increase the number of licenses in the target tenant to accommodate all mailboxes that will be migrated from the source tenant.

• Create administrator accounts in the source and target tenants for use during migration.

Migration:

• Use third-party Office 365 migration services or PowerShell scripts to migrate mailboxes, instances, OneDrive accounts, and domains from one tenant to another.

• Ensure that all data is migrated successfully and verify its integrity.

• Perform post-migration testing to ensure that all systems, applications, and services are working as expected.

• After the migration is confirmed successful, deactivate the old tenant or perform the necessary cleanup tasks.

• You can check out this guide on tenant to tenant migration if you are planning to perform the migration manually.

Training and support:

• Provide training or support on how to use the new Office 365 environment.

• Inform users about the migration and any upcoming changes.

• Establish ongoing user support and system monitoring in the new tenant for an efficient transition period.

Conclusion:

It is recommended that you work with Microsoft Consulting Services or a Microsoft partner to perform Office 365 tenant migration, including the use of third-party tools to migrate content.

Please note that migrating from one Office 365 tenant to another can be a complex process and it is recommended that you review the additional resources provided in the cited sources for more detailed information specific to your situation.