We plan and de-risk first
A full discovery and a documented risk assessment — data, downtime, authentication and third-party senders all mapped before anyone touches a mailbox.
Email Migration
Email Migration Without Business Disruption
Moving email is high-risk and routinely botched — years of mail, calendars and contacts on the line, and downtime nobody can afford. We plan it properly, migrate in stages with a tested rollback, and verify zero data loss — so the platform changes and your team barely notices, except that it finally went right.
- Verified zero data loss
- Tested rollback plan
- Minimal, planned downtime
- Hardened at the new home
Why this matters
A botched migration loses mail, time and trust.
Most migrations go wrong in predictable ways — and the business feels every one of them. The fear is rational: this is the project IT dreads because the downside is so visible.
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Data goes missing
Mail, calendars, contacts and shared mailboxes get dropped or corrupted when a move is rushed or unplanned.
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Email goes down mid-switch
An unplanned cutover takes email offline during business hours — no quotes, no invoices, no client comms.
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Mail stops landing
Authentication is left broken at the new home, so legitimate mail starts going to spam right after the move.
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Third-party senders break
CRM, invoicing and marketing tools that send as your domain are forgotten — and silently stop being trusted.
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No way back
Without a tested rollback, a migration that hits the unexpected can strand the business with no safe return.
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Nobody owns the outcome
A part-time, fingers-crossed move leaves no one accountable when something goes wrong at the worst moment.
We replace fingers-crossed with a documented plan, a staged cutover and a tested rollback — so the move is controlled, reversible and owned end-to-end, and you keep full admin control throughout.
The Mailoza approach
A staged migration, never a fingers-crossed switch.
Email Migration is a disciplined, owned project: we plan it, stage it, test it and verify it. The goal is simple — the platform changes without losing a message or an hour of unexpected downtime.
We migrate in stages
Data is pre-seeded and migrated in waves with the source kept authoritative until cutover, so there is no big-bang gamble.
We keep a tested rollback
Every migration carries a verified ability to return to the previous state — we plan for the bad day so it never strands you.
We verify zero data loss
Migrated mail, calendars, contacts and shared resources are checked against the inventory — verified, not assumed.
We harden the new home
Authentication and security are configured correctly at the destination, so mail keeps landing and the foundation is clean from day one.
We own the cutover
One accountable partner runs the window, validates immediately and supports you through stabilisation — you keep full admin control.
What's included
A complete, planned migration — not just a data copy.
Every migration covers the work that makes a platform move safe: planning, staging, cutover, validation and post-move hardening. Scope is set from a discovery assessment so the plan fits your environment.
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Discovery & inventory
A full inventory of mailboxes, shared resources, calendars, contacts, distribution lists, third-party senders, DNS and mail volumes before any work begins.
Outcome Nothing is forgotten, because everything is catalogued first.
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Migration plan & risk assessment
A documented plan with sequencing, the cutover window, a communication plan and a per-migration risk assessment — each risk with a mitigation and an owner.
Outcome You can see exactly how the move is controlled.
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Pre-migration preparation
Destination provisioning, authentication and DNS readiness, DNS TTL pre-lowering, and a pilot or sample migration validated before the full run.
Outcome The full migration runs on a path that is already proven.
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Staged migration in waves
Data pre-seeded and migrated in waves with integrity checks after each wave, keeping the source authoritative until cutover.
Outcome No big-bang gamble and no surprise gaps.
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Planned cutover
A precise cutover runbook — timing, sequence, MX and routing changes, validation steps, go/no-go criteria and named owners — executed in the agreed window.
Outcome Downtime stays inside the window you signed off.
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Tested rollback plan
A defined, verified ability to return to the previous state if cutover hits the unexpected — tested, not theoretical.
Outcome A migration can never leave you stranded.
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Validation & hardening
Post-cutover validation of data integrity, mail flow, calendars, contacts and shared resources, plus authentication and security configured at the new home.
Outcome Mail keeps landing and the new platform starts secure.
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Hypercare & handover
A defined post-migration support window for stabilisation and user issues, a validation report, a user communication pack, and a deliberate handoff to managed support or monitoring.
Outcome The move is stabilised and stays fixed.
Any direction, any platform
Migrate to, from or between any of these.
We migrate across Microsoft 365, Google Workspace and self-hosted mail in any direction, and off legacy on-prem Exchange to a modern target. We advise on the right destination — not the one that pays us best.
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Microsoft 365
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Google Workspace
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Mailcow
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Stalwart
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Linux Mail Servers
- Legacy Exchange
How we deliver
A staged method that plans for the bad day.
We move email the same disciplined way every time, so the cutover is calm and you always know what happens next.
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Discovery & assessment
We inventory every mailbox, resource, calendar, third-party sender and DNS record, and assess the risks — so the plan fits reality.
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Plan & prepare
We design the approach, sequencing, cutover window and rollback plan, then provision and secure the destination and pre-lower DNS TTLs.
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Pilot & stage
We validate a pilot migration, then migrate data in waves with integrity checks, keeping the source authoritative until cutover.
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Cutover
We switch MX and routing in the agreed window against a precise runbook with go/no-go criteria, and validate immediately.
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Validate & harden
We verify zero data loss against the inventory, confirm authentication is passing, and harden security at the new home.
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Hypercare & handover
We support a defined stabilisation window, deliver the validation report, then hand off to managed support or monitoring.
What you receive
Provable, documented outcomes — not just a moved mailbox.
A migration is a project with real artefacts you keep, so the move is auditable and the new environment is documented.
- A migration plan and documented risk assessment
- A pre-migration checklist and prepared, secured destination
- A staged cutover plan with go/no-go criteria
- A tested, verified rollback plan
- Migrated mailboxes, calendars, contacts and shared resources
- Post-migration authentication and security configuration
- A validation report confirming zero data loss
- A user communication pack
- A defined post-migration support (hypercare) window
- A deliberate handoff to managed support or 24×7 monitoring
Priced on outcome and scope — never per mailbox. A fixed, agreed project cost, framed against the cost of a botched move or a day of lost email.
Is this the right service?
When Email Migration is the right call.
Migration fits a planned platform change with real risk to manage. Here is how to tell it apart from a configuration fix or a recovery job.
Start here when…
- You are planning a move to, from or between M365, Google Workspace or self-hosted mail
- You are under legacy or end-of-life pressure and need off old on-prem Exchange
- You are consolidating email after a merger or acquisition
- You are moving to or from self-hosted email and want it done safely
- You want a clean, secured foundation before starting a managed relationship
- A previous DIY move felt too risky to attempt without specialist ownership
A different service fits better when…
- Your current platform is fine and only needs configuration or security work — start with Email Security or Infrastructure
- A previous migration was botched and you need recovery, not a fresh move — start with Emergency Email Support
- Mail is actively down or being rejected right now — start with Emergency Email Support
- You only need authentication or DNS corrected — start with an audit to scope the smaller fix
Questions
Answers, in plain English.
Will we lose any email, calendars or contacts?
No — we verify zero data loss against the inventory we take at discovery. Migrated mailboxes, calendars, contacts and shared resources are checked, not assumed, and the result is confirmed in a validation report.
How much downtime will the migration cause?
Minimal and planned. We migrate in stages with the source kept authoritative until cutover, then switch routing in an agreed window. Any short disruption happens inside the window you sign off — not as a surprise during business hours.
What happens if something goes wrong during cutover?
Every migration carries a tested rollback plan — a verified ability to return to the previous state. We plan for the bad day, so a cutover that hits the unexpected can be safely reversed rather than leaving you stranded.
Which platforms can you migrate between?
Any direction across Microsoft 365, Google Workspace and self-hosted mail (Mailcow, Stalwart, Linux), and off legacy on-prem Exchange to a modern target. We advise on the right destination for you, not the one that pays us best.
Do you handle our third-party senders, like CRM and invoicing tools?
Yes. We catalogue every legitimate sending source at discovery and configure authentication for them at the new home, so the tools that send as your domain keep being trusted after the move.
Will our mail still reach the inbox after we move?
Yes — that is part of the job. We configure SPF, DKIM and DMARC correctly at the destination and validate that authentication is passing, so legitimate mail keeps landing instead of dropping into spam.
Do we keep control of our own environment?
Yes. You keep full admin ownership of the source and destination throughout. We operate under an agreed access model and document the work, so nothing is a black box.
How is a migration priced?
On outcome and scope, as a fixed, agreed project cost — never per mailbox. The cost is framed against the risk of a botched move or a day of lost email, with clear, fair terms.
What support do we get after the move?
A defined hypercare window for stabilisation and user issues, then a deliberate handoff to Managed Email Support or 24×7 monitoring — so the freshly migrated environment stays fixed.
Can you recover a migration another provider botched?
If a move has already gone wrong and mail is at risk, that is a recovery job — start with Emergency Email Support so we can stabilise it first, then plan a clean migration from there.