A Guide to Tenant-to-Tenant Migrations in Microsoft 365

A Guide to Tenant-to-Tenant Migrations in Microsoft 365

A tenant-to-tenant migration might be the answer if you are looking into consolidating your Microsoft 365 environment or separating your data for different business units. This blog post delves into the technical aspects, motivations, and best practices for navigating this process. 

Understanding tenant-to-tenant migrations and why businesses do them 

Imagine moving your entire digital office from one building to another. A tenant-to-tenant migration facilitates the secure transfer of user mailboxes, SharePoint site content, and OneDrive for Business data from a source tenant (your legacy tenant) to a target tenant (the new destination).  Read more about tenant-to-tenant migrations here.

Businesses opt for this type of migration during mergers and acquisitions to achieve user mailbox and data consolidation under a single tenant structure. It can also be utilized during business unit divestitures to establish data silos for independent identities. 

Challenges and mitigation strategies 

Even the most meticulously planned migrations can encounter roadblocks. Here’s how to address common challenges: 

  • Data loss prevention: Third-party solutions or partnering with a Microsoft Solutions Partner (MSP) can minimize the risk of data inconsistency or loss. 
  • Minimizing downtime: While brief interruptions are unavoidable, strategic planning can significantly reduce their impact. Schedule migrations for off-peak hours or consider tools that enable a staged cutover process. 

Planning for a successful tenant-to-tenant migration 

Before starting a migration process, consider these crucial factors: 

  • Domain name constraints: While user mailboxes, files, and other data can be seamlessly migrated, the source tenant’s name cannot be transferred. Each M365 tenant is anchored to a unique domain. However, there are workarounds to mitigate disruption. In a merger scenario, post-migration updates to user email addresses can reflect the new domain. Consulting with your IT team or a qualified migration partner can help you determine the most suitable approach for your specific domain configuration. 
  • Downtime and user impact: Expect brief periods of service interruption, and users might need to reconfigure their Outlook and OneDrive profiles. Communicate these changes transparently to minimize disruption and ensure a smooth user experience post-migration. 
  • Licensing considerations: Existing user licenses are not transferable between tenants. You’ll need to acquire new licenses for the target tenant. This can be a cost factor, so it’s crucial to assess the number of users being migrated and their specific licensing requirements. Working with your Microsoft representative or a qualified IT provider can help you determine the most cost-effective licensing strategy for your migration project. 

Succeed in your Microsoft Cloud Projects

With Team Venti's expertise and Microsoft's best practices on Azure
modern business meeting IT management

Succeed in your Microsoft Cloud Projects

With Team Venti's expertise and Microsoft's best practices on Azure


Team Venti’s approach to successful migrations 

At Team Venti, we understand the intricacies of tenant-to-tenant and any kind of cloud migrations. Here’s what differentiates our approach: 

  • Collaborative methodology: We foster close collaboration with all stakeholders, ensuring a seamless handover between the source and target tenant administration teams. 
  • Data-centric security: Data security is paramount. We employ a copy-first approach, ensuring data integrity until both sides acknowledge a successful migration. 
  • Client-centric communication: We prioritize clear and consistent communication throughout the process, actively addressing your specific needs and preferences, including out-of-hours migrations to minimize business disruption. 
  • Proven migration expertise: Our extensive experience ensures efficient and streamlined migrations with minimal downtime.

Remember, a successful tenant-to-tenant migration hinges on meticulous planning, clear communication, and prioritizing data security. By adhering to these principles, you can ensure a smooth transition and a well-organized digital environment for your business. 

Ready to navigate your M365 tenant-to-tenant migration with confidence? Contact Team Venti today for a free consultation. Our team of experts will assess your specific needs and develop a customized migration plan to ensure a seamless transition for your users and data. 

Picture of Lucy Camero

Lucy Camero

Team Venti Brand Manager

Sign up to learn more

Get news, updates, and insights about Microsoft solutions, technologies, and best practices.

Share This Story, Choose Your Platform!

Related posts

Azure Cloud Migration Readiness

This Microsoft-funded evaluation will guide your organization to migrate seamlessly to Azure

Recent Posts



The BlueSky Contact Center for Microsoft Teams

Modernize your operations and standardize all company communications on a single platform