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MIGRATION & MODERNIZATION

Move what matters. Modernize what should not move as-is.

Plan every Azure and Microsoft 365 migration around dependencies, risk, and business priority — so each workload is moved, refactored, or retired for a clear reason, not lifted and shifted by default.

  • Discovery & wave planning Workloads, dependencies, and owners are mapped first, so the migration sequence rests on facts rather than assumptions.
  • Server & database migration Servers and databases move with defined cutover, validation, and rollback paths — the moments where migrations usually get tested.
  • Modernization roadmap Every workload gets a deliberate decision: move as-is, refactor where it matters, replace, or retire.
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YOUR CHALLENGES

Migration is not a moving task. It is a decision point. What moves, what changes, and what should be retired?

Migration risk grows when teams start with servers, mailboxes, databases, and applications before they understand dependencies, ownership, business priority, and modernization options. Without discovery and wave planning, every move becomes a separate exception.

  1. Migration starts before anyone knows what actually depends on what

    Servers, databases, file shares, identities, integrations, scheduled jobs, and business processes are often discovered only after the move has started.

    A migration plan is only as reliable as the discovery behind it. Without a dependency view, teams move workloads in the wrong order, break integrations, miss owners, and create avoidable downtime.

    • Dependencies and owners surface only after something breaks mid-move
    • No single view of what runs where, or what talks to what
    • Migration order is guessed, so the wrong things move first

  2. Every workload becomes urgent when there is no migration sequence

    Teams know everything has to move, but not what should move first, what can wait, or which systems must stay together.

    Without a migration sequence, every workload competes for the same window. Teams move things in the wrong order, discover dependencies mid-cutover, and have no agreed way to pause or roll back when a wave goes wrong.

    • Everything is labelled urgent because nothing is sequenced
    • No clear view of what must move together — or what can wait
    • No agreed rollback or acceptance criteria when a wave goes wrong

  3. Moving everything as-is carries old problems into the new platform

    Legacy architecture, unused servers, oversized databases, manual processes, and outdated security assumptions do not become better because they run in Azure.

    Migration is the right moment to decide whether a workload should move as-is, be refactored, replaced, or retired. Without that decision, the cloud inherits the cost, complexity, and fragility of the old estate.

    • Legacy cost, complexity, and fragility move to Azure unchanged
    • Unused servers and oversized databases get rebuilt as-is
    • Nobody decides what should be refactored, replaced, or retired

  4. Databases and business data create the highest migration pressure

    Applications can often tolerate delays. Data cutovers, sync windows, reporting dependencies, and rollback decisions are where migration plans usually get tested.

    Data is where migrations get tested. When movement, downtime, validation, and rollback aren't settled in advance, cutover becomes the moment everyone discovers what was missing from the plan.

    • Cutover windows, sync, and rollback get figured out under pressure
    • Data validation gaps surface only after go-live
    • Business owners learn about downtime when it's already happening

  5. The migrated environment is live, but nobody owns how it should evolve

    After go-live, teams still need monitoring, access, cost ownership, support paths, documentation, and a roadmap for what gets modernized next.

    A workload that's running isn't a workload that's owned. Without an operating model the new environment has no clear owner for cost, access, support, or what gets modernized next — so it drifts the same way the old estate did.

    • Live environment with no clear owner for cost, access, or support
    • Monitoring and documentation never made it into handover
    • Modernization stalls — there's no roadmap after go-live

THE MIGRATION DECISION

Four paths for every workload. The default one is the most expensive.

Move, refactor, replace, or retire — every workload takes one of these paths. When nobody decides, everything quietly takes the first one, and the old estate's costs and risks get rebuilt in Azure at cloud prices.

WHAT A RUSHED MIGRATION LEAVES BEHIND

  • Everything moves as-is No workload was questioned, so the cloud now runs the old estate at new prices.
  • Surprises mid-wave Dependencies get discovered during cutover instead of during discovery.
  • No rollback plan The first failed cutover turns into an all-night incident.
  • Retired systems still billing Workloads that should have been switched off were moved instead.

  1. Move only what earns its place

    Decided by default

    Everything gets rehosted because nobody had time to ask questions. Oversized servers and fragile architecture arrive in Azure — with a new invoice attached.

    Decided with Caellix

    Only workloads that earn their place move unchanged: stable, compliant, right-sized, and cheaper to run than to change.

  2. Refactor while change is cheap

    Decided by default

    The workloads that needed change move as-is 'for now'. After go-live the budget moves on — and 'for now' becomes the next five years.

    Decided with Caellix

    The refactors that pay for themselves — PaaS, managed databases — get delivered during the move, at the moment change is cheapest.

  3. Replace what's not worth carrying

    Decided by default

    Custom code nobody wants to own gets migrated, patched, and maintained — years after a managed service made it redundant.

    Decided with Caellix

    Where a service already does the job better, we retire the code and migrate the data. One less system to run, secure, and pay for.

  4. Retire what nobody uses

    Decided by default

    'Probably still needed' servers move to Azure and start billing monthly. Nobody checks, because checking was never in the plan.

    Decided with Caellix

    Usage evidence decides. What nobody touches gets archived and switched off — before it ever generates a cloud invoice.

WHAT WE OFFER

Complete migration services, from discovery to modernization.

We plan and execute Azure and Microsoft 365 migrations end to end — discovery, wave planning, server, database, and Microsoft 365 moves, and the modernization work that decides what should not move as-is.

Discovery & dependency assessment

We map the estate before anything moves — servers, databases, applications, file shares, and integrations — with owners, dependencies, and business priority attached to every workload.

  • Estate inventory across infrastructure, applications, and data
  • Dependency map showing what talks to what
  • Usage and sizing data measured per workload, not copied from old specs
  • Owners, constraints, and business priority confirmed per system
  • Move, refactor, replace, or retire recommendation for every workload
DiscoveryDependency MappingAssessment

Migration strategy & wave planning

Every workload gets a path and a place in the sequence. Waves are scoped around risk, dependencies, and business calendars — with acceptance criteria and rollback defined before anything moves.

  • Wave plan with scope, order, and the reason for both
  • Acceptance criteria and rollback path agreed per wave
  • Cutover windows aligned with the business calendar
  • Risk register with mitigations for every wave
  • Decision log the business can review at any point
Wave PlanningSequencingRollback

Server & VM migration

Virtual machines and physical servers move to Azure with validated sizing — not a copy of the old hardware order. Every move is tested first and reversible until sign-off.

  • Azure Migrate replication with test cutovers before the real one
  • Targets right-sized from measured usage, not old specs
  • Network, identity, and access prepared in the target first
  • Post-move validation against a performance baseline
  • Source kept intact until the wave is accepted
Azure MigrateRehostValidation

Database & data migration

Databases move with a defined approach to sync, downtime, validation, and rollback — agreed with the business before cutover, not negotiated during it.

  • Migration path per engine — SQL Server, PostgreSQL, MySQL
  • Continuous sync so cutover windows shrink to minutes
  • Data validated before and after the move
  • Rollback to source available until final sign-off
  • Reporting and integration dependencies moved in the same wave
Azure DMSCutoverData Integrity

Microsoft 365 migration

Mailboxes, files, and collaboration content move into — or between — Microsoft 365 tenants with structure and permissions intact, including tenant-to-tenant moves after mergers.

  • Mailbox migration from on-prem Exchange or another tenant
  • File shares and SharePoint content moved with permissions intact
  • Teams structure and content carried across
  • Identity mapping and coexistence while both sides run
  • User communication and cutover-day support included
ExchangeSharePointTenant-to-Tenant

Modernization & optimization

Workloads marked refactor, replace, or retire get delivered — PaaS adoption, service replacements, clean decommissions — plus the post-migration review that stops the new estate drifting like the old one.

  • Refactor candidates moved to PaaS and managed services
  • Replacements delivered including the data migration
  • Retired systems switched off with data archived properly
  • Post-migration cost and performance review
  • Modernization backlog handed over with owners assigned
PaaSModernizationOptimization

The net result

An estate that's smaller, cheaper, and easier to run than the one you left.

When migration runs as a set of deliberate decisions, the destination isn't a copy of the old datacenter — it's a smaller, better-understood estate with a plan for what comes next.

  1. 01

    Every workload accounted for — moved, refactored, replaced, or retired, with the reason on record

  2. 02

    Cutovers that happen in planned windows, with rollback ready and owners informed

  3. 03

    No surprise dependencies — integrations mapped before the move, not discovered during it

  4. 04

    A target environment sized for measured usage, not the old hardware order

  5. 05

    Microsoft 365 content that arrives with structure and permissions intact

  6. 06

    A documented estate your team can run — plus a modernization backlog with owners

Assessment

Discover the estate

Azure Migrate

Inventory, dependency visualisation, and sizing recommendations come from measured data, not stale spreadsheets.

Data

Move databases

Azure Database Migration Service

Continuous sync keeps source and target aligned, so database cutovers shrink from weekends to minutes.

Content

Migrate content

ShareGate

SharePoint, Teams, and file-share content moves with structure, permissions, and metadata intact.

Resilience

Protect the cutover

Azure Site Recovery

Replication keeps a tested way back, so a failed cutover is a rollback — not an incident.

Automation

Build the target

Terraform

Target environments are built from code, so every wave lands on the same reviewed foundation.

Delivery

Run the waves

Azure DevOps

Waves, approvals, and rollbacks run through pipelines and boards — visible, repeatable, auditable.

Platform

Land the workplace

Microsoft 365

Mail, files, and collaboration land in one governed platform instead of a patchwork of migrated servers.

Email

Move mailboxes

Exchange Online

Mailbox batches run with coexistence, so mail keeps flowing while the migration is underway.

HOW WE WORK

From discovery to a modernized estate.

A migration engagement runs in three phases — assess, migrate, modernize — with a decision point between each, so the business always knows what moves next and why.

01

Assess & decide

Discovery, dependencies, and the wave plan

Discovery tooling and workshops produce a mapped estate: what runs, what depends on what, who owns it, and what it costs. Every workload leaves this phase with a path — move, refactor, replace, or retire — and a place in the sequence.

  • Estate inventory with owners and dependencies
  • A documented decision for every workload
  • Wave plan with rollback and acceptance criteria
  • Target architecture and readiness check
02

Migrate in waves

Controlled moves with tested rollback

Each wave moves on its own schedule with acceptance criteria agreed up front. Test cutovers run first, business owners sign off, and rollback stays available until the wave is formally accepted.

  • Test cutover before every production move
  • Server, database, and Microsoft 365 moves executed
  • Validation and sign-off per wave
  • Rollback path live until acceptance
03

Modernize & hand over

Refactor, retire, and run

Workloads marked for change get refactored or replaced, retired systems are switched off properly, and the new estate is documented and handed over with a backlog your team can continue — without us.

  • Refactor and replace candidates delivered
  • Retired workloads decommissioned and archived
  • Post-migration cost and performance review
  • Documentation and modernization backlog handed over

Engagement model

How a migration engagement runs.

  1. Assessment first, with a standalone deliverable Engagements start with discovery and assessment that ends in a wave plan — a deliverable you can evaluate, and use, before committing to the move.
  2. Waves as separate commitments Each wave is scoped, priced, and accepted on its own. You can pause, reorder, or stop between waves without renegotiating the engagement.
  3. Your team inside the project Your admins and system owners work alongside us through every wave, so the knowledge lands in your team — not in a contractor's notebook.

WHAT YOU CAN COUNT ON

Commitments that hold for every wave.

  • No workload moves without an agreed rollback path.
  • Cutover windows are set with the business, never sprung on it.
  • Every move, refactor, replace, or retire decision is documented with its reason.
  • You can stop or reorder waves at any decision point.
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FAQ

Questions clients ask before migrating.

Less than most teams fear, but never zero — and never a surprise. Test cutovers and continuous sync shrink the real switch to a planned window agreed with the business in advance. Workloads with strict availability needs get their own cutover approach instead of inheriting a generic one.

No. Migration runs in waves, and each wave only touches its own workloads. Coexistence keeps mail flowing and files accessible while both sides run, so for most of the company the migration is a calendar notice, not an interruption.

We roll back. The source stays intact and the rollback path stays live until the wave is formally accepted — that is a standing rule, not an option. Because every production move is preceded by a test cutover, a failed cutover is a controlled return, not an incident.

Per workload, not per migration. The assessment shows where a targeted refactor pays for itself immediately — usually databases and oversized infrastructure — and where moving as-is and modernizing later is the better economics. You see that recommendation, with reasons, before anything moves.

Yes. Tenant-to-tenant Microsoft 365 migration covers identity mapping, mailbox moves, SharePoint and Teams content, and coexistence while both organisations keep working. Naming, permissions, and structure are agreed before content moves, so the new tenant starts organised instead of inheriting two kinds of chaos.

Not everything has to move. The assessment can mark workloads to stay on-premises, be replaced by a service, or be retired — each with a documented reason. What stays gets hybrid connectivity to the new environment, so it remains a working part of the estate rather than an orphan.

A standalone deliverable: estate inventory with owners and dependencies, a move, refactor, replace, or retire decision for every workload, a wave plan with rollback criteria, and a target architecture. It is designed to be usable on its own — including with another delivery partner, if that is what you choose.

NEXT STEPS

Plan the move before the migration starts.

Start with discovery, dependencies, and a wave plan that makes clear what should move, what should change, and what should be retired.

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