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Microsoft 365 Migrations & Strategy

M365 Migrations & Tenant Merger

Whether you're facing a merger, acquisition, or business rebrand, tenant-to-tenant migrations shouldn't disrupt operations. Valto makes the complex simple with minimal downtime, zero data loss, and expert-led change management.

Microsoft 365 Tenant-to-Tenant Migrations Made Simple

Whether you're facing a merger, acquisition, or business rebrand, tenant-to-tenant migrations shouldn't disrupt operations. Valto makes the complex simple with minimal downtime, zero data loss, and expert-led change management.

Why Choose Valto?

Zero Downtime, Maximum ContinuityWe complete key migrations outside of business hours, ensuring operations continue uninterrupted while we handle everything in the background.

Data Integrity GuaranteedIn-depth workshops, pilot runs, and post-move validation ensure every file, setting, and permission is migrated without loss.

Clear, Confident CommunicationWith structured comms, video training, and live Q&A sessions, we help every team member adapt—without confusion or disruption.

Downtime derails business continuity

Our Solution: We plan and execute cutovers outside core hours, replicate Azure services in advance, and monitor every step to ensure no interruptions.

“Watkin Jones relied on us to complete a full tenant migration over a single weekend—with student services back online by Monday.”

Poor communication causes user resistance

Our Solution: We guide every user through the journey with tailored webinars, training videos, and structured email campaigns.

“NHS trusts used our Microsoft-certified adoption specialists to inform and support over 3,800 staff across hospitals with zero disruption.”

Data loss is a critical business risk

Our Solution: From workshops to post-move checks, our migrations are designed to prevent data loss at every step.

“VSI Group migrated complex assets across global tenants without losing a single business-critical function.”

Cost uncertainty adds risk

Our Solution: We provide a fixed-price proposal based on structured discovery sessions, so you always know where you stand.

“HCR Law trusted us to deliver a secure, fixed-cost migration following a major acquisition.”

Our Tenant-to-Tenant Migration Services

All migrations begin with a structured workshop. Not every business needs every service—we help you choose what's right for your needs.

Microsoft 365 Tenant Migration Workshop

Navigate mergers and restructures with a clear roadmap for mailboxes, Teams, SharePoint, OneDrive, and identity migration.

Security & Compliance Workshop

Optimise compliance posture across identity, audit logging, access controls, and data protection.

Azure Migration Workshop

Design or refine Azure architecture, including cross-tenant AD integration and security alignment.

See How We’ve Transformed Businesses Across the UK.

Real examples of how Valto supports Tenant-to-Tenant Migrations for partners, public sector and private businesses:

View All Case Studies

Why Work with Valto?

Founded in 2017, Valto is a leading UK Microsoft Partner with offices in Chester, Southampton, and the USA. Our mission: intelligent, interruption-free Microsoft 365 environments. Our guarantee: transparent costs, certified expertise, and migrations built around your users—not just your data.

Migrate Without the Mayhem

Avoid the pain of downtime, poor communication, or data risk.

The Numbers Speak for Themselves

Microsoft 365 Tenant Migrations

100+ successful Microsoft 365 tenant migrations

Secure Migrations

500+ million files migrated securely

34,000+ seats transitioned

Thousands moved. Limited downtime.

SharePoint Intranet Workshop

Build a SharePoint site that supports collaboration and reflects your new brand identity.

Google Workspace to M365

Transition from G Suite to Microsoft 365, including coexistence planning and governance.

GoDaddy to Microsoft 365

Seamless roadmap for transitioning email, calendars, and documents from GoDaddy to M365.

We’ve helped businesses including the NHS, Watkin Jones, HCR Law, Campbell Reith, and VSI Group complete secure, scalable migrations.

AstraZeneca
BBC
Shell

“Working with Valto has been straight forward from the outset, starting from advice regarding how to approach the project, through detailed expert consultancy, excellent communication throughout coordinated by the Valto Project Management team and comprehensive post-project support, all of which has seen this project delivered smoothly with minimal impact on our ongoing operation.”

Robert De’Ath, Group Head of IT, Watkin Jones

“We are pleased with the exchange and tenant migration project handled by Valto on behalf of Energy One. The project was undertaken successfully and within the agreed timescales, helping to ensure business continuity.”

Matt Spence, Head of Service Delivery

“Valto helped us migrate thousands of files into Microsoft 365 with no downtime. Everything was scoped, tested, and executed flawlessly.”

Anonymous, Verified Customer

Our Proven 5-Step Migration Process

  1. 1

    1. Free Consultation

    Understand your drivers, scope, and timelines. Get a high-level proposal at no cost.

  2. 2

    2. Migration Workshop

    Detailed assessment of source/destination tenants and fixed-price proposal.

  3. 3

    3. Data Preparation

    Resolve identity conflicts, sync issues, and refine data structures.

  4. 4

    4. Staged Migration Rollout

    Phased migrations for mailboxes, Teams, SharePoint and more—monitored every step.

  5. 5

    5. Training & Adoption

    Train users, equip champions, and ensure everyone’s ready to thrive.

Lanterna case study thumbnail

Case study

Lanterna logo

Working with Lanterna to turn AI into reality for a leading law firm client

Lanterna, a legal sector technology and transformation consultancy, partnered with Valto to bring an innovative AI concept to life for a leading law firm client.

  • Power Platform
Read the story

Frequently asked questions

It involves moving mailboxes, OneDrive, Teams, SharePoint and users from one Microsoft 365 environment to another—typically after a merger or rebrand.
We plan around your schedule. Most migrations happen out of hours and avoid user disruption.
Mailboxes, OneDrive, SharePoint, Teams, Azure AD, and more.
Usually yes—but we provide guidance and clear instructions.
We assess and update these where necessary to maintain access.
All data is encrypted and migration tools are Microsoft-approved. We follow ISO 27001 and GDPR best practices.
Small projects: 3–4 weeks. Larger ones: phased over several months. You’ll get a custom timeline.
Yes—we include these in our workshops and execution plans.
Absolutely. We offer end-user training, Train-the-Trainer options, and change management support.

Talk to our team

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Talk to us about M365 Migrations & Tenant Merger