Exchange Online migration planning and execution to move mailboxes and data to Microsoft 365
We help organisations migrate on-premises or hosted Exchange mailboxes and associated data to Microsoft 365 Exchange Online using migration methods that align with your scale and coexistence needs.
This service covers planning, migration path selection, mailbox movement and post-migration validation so your email data, calendars and contacts are migrated securely and with continuity for users.
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Service Overview
Highlights
- Exchange Online migration path assessment
- Cutover and staged migration support
- Mailbox data movement and validation
- Post-migration configuration and handover
Business Benefits
- Move mailboxes and mailbox data to Microsoft 365 Exchange Online
- Flexibility to use cutover or staged migrations based on size
- Maintain user experience and minimise downtime
- Operational handover and documentation
Typical use cases
- Small to medium on-premises Exchange environments
- Organisations transitioning to cloud-native workloads
- Migration from legacy or hosted email systems
- Preparation for full Microsoft 365 adoption
Objectives & deliverables
What Success Looks Like
- Assess source email environment and data volumes
- Define an Exchange Online migration strategy
- Perform data migration in chosen waves
- Validate mail flow, profiles and access post-migration
What You Get
- Migration assessment report
- Exchange Online migration plan
- Mailbox movement artefacts and logs
- Post-migration validation and handover
How It Works
- Evaluate source mail environment and constraints
- Choose migration method (cutover, staged or hybrid express)
- Configure migration endpoints and run batches
- Verify data integrity and update DNS routing
Engagement Options
- Migration Path Workshop
- Cutover Migration Delivery
- Staged Migration Execution
- Post-Migration Support and Optimisation
Additional Information
Prerequisites & licensing
Before beginning migration to Exchange Online, ensure your DNS, directory integration and mailbox enablement prerequisites are confirmed and that you have the appropriate Microsoft 365 licences.
- Verified domain in Microsoft 365 tenant
- Appropriate Microsoft 365 Exchange Online licences
- Connectivity to source environment for mailbox migration
- DNS planning for mail routing cutover
Security & Compliance Notes
- Mailbox migration involves handling sensitive user data
- Migration endpoints should be secured and monitored
Common Bundles
Customers who use this service often bundle with these services
Identity & Access Enablement Workstream
Configure Entra ID conditional access, privileged identity management, and governance features unlocked by E3 to E5 upgrades licensing.
Tenant-to-Tenant Migrations
Plan and execute tenant to tenant migrations across Microsoft 365 workloads, preserving data, identities and access during organisational change.
Migration Planning Workshops
Structured workshops to define migration scope, risks, dependencies, and priorities, producing clear actions and a realistic plan documented.
Adoption Readiness Workshop
Assess adoption readiness through a focused workshop that defines personas, communications, training, champions, and success metrics before rollout.
Adoption Planning (End Users)
Plan end user adoption with structured communications, targeted training, champion networks, and measurement that supports confident use and sustained value.
Adoption Planning (Admins)
Prepare administrators for new service rollouts with clear governance, defined responsibilities, operational plans, and tooling to support sustained adoption.
Adoption Metrics & Feedback Framework
Define, measure, and report technology adoption using structured metrics and feedback loops that link user behaviour to business outcomes.
Frequently Asked Questions
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