Information Technology

How This Business Moved All Emails with Office 365 Tenant to Tenant Migration


In a natural business cycle, companies merge with another company which means they want to integrate their IT systems, data, and servers into one single unit. Other scenarios would require tenants to be consolidated on various versions of Office 365 in the same organization to reduce time and money. All of this can be achieved using Tenant to Tenant Migration.

If two or more businesses use the same platform i.e. Office 365, it doesn’t make the job any easier. You’ll have to migrate your mailboxes, domains, and files just like one would do in a migration project. Greater the number of services you’re using, the bigger the Office 365 Tenant to Tenant migration project is.

This guide will walk you through the process of how the Microsoft 365 Tenant-to-Tenant Migration work.

 Steps of Office 365 Tenant to Tenant Migration

  • Planning for Pre-Migration

The migration doesn’t happen overnight. You should plan Tenant to Tenant Migration two weeks before the scheduled day to avoid any unwanted circumstances. You need to follow certain pre-requisites for the Migration to go smoothly.

  • Target the Tenants

To migrate mailboxes from Source tenant to target tenant, you need to create a room to add new mailboxes/resource mailboxes and groups in the target tenant. The admin accounts of both source and target tenants will be created to initiate the tenant-to-tenant migration process.

  • Domain Preparation

The source tenant needs to be merged with the target. Add the source tenant to the target’s Microsoft 365 admin center and create TXT records for the verification of DNS.

  • Schedule Migration

Create a CSV file that contains all of the email addresses that need to be migrated to the target tenant’s mailbox. Note the lowest value of time to live on the MX record and then disable the directory sync of the source tenant. Once the sync has been disabled, any changes in the source tenant won’t be reflected.

  • Stopping incoming emails

Use a third-party service to stop the inbound emails to the source tenant. The migrating server should alert the mail servers that it shouldn’t send new emails.

  • Source Tenant Preparation

For a successful Office 365 Tenant to tenant migration, you need to remove the Source tenant domain and reset the settings such as your default email address, resources, and rooms to the initial domain. Secondary email addresses should also be removed from the tenant objects. Wait for an hour before proceeding to prepare the target domain.

  • Target Tenant Preparation                            

Activate new user accounts and assign new licenses to each user in the target domain. The primary email address should be the source domain and then finally set up the password. Now your mailbox will start receiving emails.

  • Migrate objects to new accounts

To move contacts and calendars to your new account, there are different migration techniques such as hybrid migration, staged migration, and cutover migration. Choose the appropriate method. Once done, your Office 365 Tenant to tenant migration has been completed.

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