Microsoft 365 Tenant to Tenant Migration

For small organisations (under 50 users), a full tenant migration takes 3–7 business days. Mid-market companies (50–500 users) typically complete in 2–4 weeks. Enterprise deployments (500+ users) are scoped individually but usually run 4–8 weeks. We provide a detailed project timeline during the free discovery call before any work begins.

Small Business (10–50 users) is $40 per mailbox for Exchange Online only, delivered in 24–48 hours with a 50GB data limit — minimum project $400 (10 users), maximum $2,000 (50 users × $40). Mid-Market (50–500 users) is $30 per mailbox for the full suite including SharePoint, OneDrive, and Teams. Users with more than 50GB of data require an Exchange Plan 2 license and are priced at $50 per 100GB of data migrated. Enterprise pricing is scoped after discovery. All pricing includes migration tool licensing, project management, and 30 days of post-migration support.

We minimise downtime through coexistence configuration. Users continue receiving and sending emails throughout the migration. The only interruption is a brief cutover window of 1–2 hours (typically scheduled at midnight or on a weekend) when Outlook profiles are updated and MX records are switched. Most users experience less than 15 minutes of Outlook reconfiguration.

Teams chat history cannot be migrated natively — Microsoft does not provide a tool for this. We use specialist third-party tools (BitTitan, AvePoint, or Quest) to migrate Teams channels, files, and tabs. For chat history, we can either archive it for compliance purposes or export it to a readable format. We discuss this during discovery so there are no surprises.

Email addresses stay the same if you're using a custom domain. We configure your domain in the target tenant before migration begins, so all external senders continue reaching you at the same address. Internal UPNs may change if required by the new tenant's naming convention, but we handle all Outlook reconfiguration automatically.

Yes. We support both phased and all-at-once (big bang) migration approaches. Phased migration is recommended for organisations with 100+ users — we migrate in department waves over 2–4 weeks, allowing IT teams to validate each wave before proceeding. This significantly reduces risk and gives users time to adjust.

Yes, with proper user mapping. SharePoint and OneDrive permissions reference user identities, which change between tenants. We build a user mapping file that links every source user to their target account. Migration tools use this to correctly reassign all permissions, preserving your entire security and sharing model in the new tenant.

We inventory all connected third-party applications during the discovery phase (Salesforce, Zoom, DocuSign, Power Automate, etc.). We create a detailed reconnection runbook specifying the re-authorisation steps for each app. On cutover day, we work through the runbook systematically so no integration is missed or left broken.

All OneDrive for Business files, folder structures, sharing permissions, and version history are migrated to the target tenant. Shared drives (SharePoint Document Libraries) are also fully migrated including site structure, metadata, content types, and permissions. We run a delta sync before final cutover to capture any last-minute changes.

We have extensive experience with hybrid scenarios. We coordinate with your on-premises Exchange infrastructure, using the Exchange Admin Center migration batch approach for cloud-hosted mailboxes and PowerShell for on-premises mailboxes. Coexistence connectors ensure seamless mail flow throughout. See our Exchange hybrid migration guide for the full technical process.

All engagements include 30 days of post-migration support at no extra charge. This covers Outlook reconfiguration issues, permission problems, any items that did not migrate correctly, and general user questions. We assign a dedicated engineer who knows your project for the entire support period — not a generic helpdesk.

No. Migration tool licensing (BitTitan MigrationWiz, AvePoint FLY, or Quest On Demand — whichever best fits your project) is included in our service fee. You do not need to purchase, set up, or manage any migration tooling yourself.