Tenant-to-Tenant Migration for Mergers, Acquisitions and Divestitures
When your organisation is merging, acquiring, or separating, Microsoft 365 isn’t just an IT project, it’s business-critical. We help you move fast, stay secure, and ensure your teams are fully operational from Day 1.
Proven migrations. At scale. One provider.
Delivered by expert Microsoft 365 migration specialists and trusted by large, complex organisations such as the NHS.
A Valto record of 20+
environments managed within a single migration programme
3,800
users migrated in a single NHS programme
11 million
files moved securely and successfully
What is a tenant-to-tenant migration?
A tenant-to-tenant migration is the process of moving your Microsoft 365 environment – including users, emails, files, Teams, and applications, from one tenant to another.
In M&A scenarios, it enables you to:
- Integrate newly acquired businesses
- Separate entities cleanly during a divestiture
- Standardise technology across a group
- Eliminate duplication, risk, and inefficiency
This isn’t just about moving data, it’s about ensuring business continuity at scale.
When you need a tenant migration
Tenant migrations happen for many reasons. Whatever’s driving yours, we’ve done it before.
Mergers and acquisitions
Bring two organisations into a single Microsoft 365 environment without disrupting operations.
Divestitures and carve-outs
Separate a business unit cleanly, securely, and on time - often under TSA pressure.
Private equity portfolio standardisation
Roll out a consistent Microsoft 365 environment across multiple businesses.
Rebranding or domain change
Move to a new tenant to align with a new identity.
Modernisation programmes
Rebuild your Microsoft 365 estate with better governance and security.
What Valto handles
From core Microsoft 365 workloads to user adoption and post-migration support – we handle every part of the process, not just the data move.
Microsoft 365 workloads
Valto manages the full Microsoft 365 tenant migration end-to-end, covering everything from core workloads such as Exchange Online, SharePoint, OneDrive and Microsoft Teams through to more complex elements of the environment.
Beyond the basics
Beyond standard data migration, we also handle business-critical components including Power Platform solutions, Azure resources and subscriptions, identity configuration, and security and compliance setup, ensuring nothing is left behind or broken during the transition.
Business critical support
Importantly, this isn’t just a technical exercise. We support the business throughout the migration with structured user communications, training, and post-migration optimisation to ensure teams stay productive and your new environment is fully adopted from day one.
A practical, outcomes-led approach to tenant migrations
At Valto, tenant-to-tenant migration isn’t just about moving data, it’s about enabling your business to operate without disruption during critical events like mergers, acquisitions, and separations.
We take the time to understand your organisation and objectives, then design a migration plan that reduces risk, protects data, and ensures Day 1 readiness. From initial discovery through to migration and optimisation, our approach is structured, transparent, and focused on real business outcomes.
Our tenant migration approach
Our structured five-step approach ensures migrations are delivered clearly, securely, and with minimal disruption, while remaining aligned to your organisation’s timelines, risks, and business objectives.
- We align the migration to your timeline, whether that’s Day 1 post-acquisition or a fixed TSA exit.
- We define how your new tenant will be structured, secured, and governed.
- We run test migrations and validate every critical workload before go-live.
- We migrate users and data in controlled phases, or execute tightly planned cutovers where required.
- We ensure your teams are productive, your data is intact, and your environment is working as expected.
We migrate more than others can
Unlike many providers, we handle the full Microsoft estate, including Power Platform solutions and Azure, not just mailboxes and files. Plus, we can back it up; Valto hold all six Microsoft Solution Partner Designations, demonstrating our end-to-end technical capabilities.
Proven tenant migration outcomes
Real tenant-to-tenant migrations, delivered securely, with minimal disruption and maximum impact.
NHS: Driving Adoption in Large‑Scale Migration
A complex migration of 3,800+ users and millions of files, supported by a structured comms and training approach to ensure zero disruption and strong user adoption.
VSI: Valto delivers a global MS365 Tenant Consolidation
Consolidated multiple international Microsoft 365 tenants into a single secure platform, improving collaboration and reducing IT complexity.
Watkin Jones: Zero‑Downtime M365 Migration
A full tenant migration completed over a single weekend, delivering zero disruption and a smoother, more efficient Microsoft 365 environment.
Frequently asked tenant migration questions
How long does a tenant-to-tenant migration take?
Timelines depend on size and complexity, but we align every migration to your business milestones, whether that’s Day 1 integration or a fixed TSA exit deadline.
Will there be downtime?
We design migrations to minimise or eliminate disruption, using phased delivery and carefully planned cutovers to keep your business running.
Can you migrate more than just email and files?
Yes – we handle full Microsoft 365 environments, including Teams, SharePoint, Power Platform solutions, and Azure resources.
How do you prevent data loss during migration?
Every migration is validated through testing and controlled cutovers to ensure data integrity and a smooth transition.
Can you support multi-tenant or complex environments?
Yes – we’ve delivered multi-tenant programmes spanning 20+ environments, including complex organisational structures.
Do you support user adoption and change management?
Yes – we support communication, training, and post-migration adoption to ensure your teams are productive from Day 1.
Ready to deliver your migration without disruption?
Speak to a Microsoft migration specialist to plan your tenant-to-tenant migration around your timelines – whether that’s Day 1 integration, a fixed TSA exit, or a complex multi-tenant programme.