Most migrations move the mess. We move what matters.
On-premise. Google Workspace. Legacy platforms. We’ve done them all.
A Microsoft 365 migration is a significant moment for your organisation. Done well, it sets up a modern, secure, governed workplace. Done poorly, it moves years of accumulated clutter into a new system, breeds distrust in the new environment, and wastes most of the investment. The difference comes down to what happens before the first file moves.
Years of Microsoft expertise
Projects delivered across Australia
Data loss, validated at every migration stage
Post-migration item validation on every project
A migration isn’t just a technical exercise.
Moving your organisation to Microsoft 365 is one of the highest-impact decisions your IT team will make. When it goes well, your people get a connected, modern workplace — email, files, Teams, and collaboration all working together the way they were designed to. When it goes badly, you spend the next two years rebuilding trust in a system people never quite adopted.
Most of the problems we see post-migration were created before the first file moved. The organisation migrated what it had — a decade of duplicated files, outdated email, inconsistent folder structures, and permissions nobody can explain — into a new environment. The new system is now just as confusing as the old one, and it cost significantly more to get there.
The answer isn’t to move faster. It’s to assess before you migrate, clean up what needs cleaning, and bring your team with you as the new environment takes shape.
- Migrating the messYears of duplicated files, stale email, and broken folder structures move across intact — and the new environment is immediately just as hard to navigate as the old one.
- Permissions nobody can explainLegacy permissions follow the data across. Nobody is sure what access people should have, so everything is granted broadly — a security and compliance problem waiting to surface.
- Adoption that never happensStaff are shown the new system once, given a PDF guide, and left to figure it out. Teams stays unused. SharePoint becomes another file drop. Email habits don’t change.
- Cutover surprisesWithout pre-migration validation, issues surface during cutover — missing data, broken shared mailboxes, calendar conflicts — when there’s no time to fix them properly.
- Governance gaps on day oneThe migration completes but nobody has set up retention policies, sensitivity labels, or DLP rules. You’re in Microsoft 365, but your compliance posture is no better than before.
- Google-to-Microsoft culture clashTeams trained on Google Drive’s mental model don’t naturally adapt to SharePoint’s structure. Without proper change management, the new environment gets used like the old one.
Every migration is different. We’ve done most of them.
The source platform shapes the complexity, the tooling, and the change management challenge. Here are the migration types Antares delivers regularly — each with its own technical and adoption considerations.
On-premise to Microsoft 365
The most common migration scenario in Australian enterprise. Moving from on-premise Exchange Server to Exchange Online, from on-premise SharePoint (2013, 2016, 2019) to SharePoint Online, and from file servers to SharePoint and OneDrive. Antares has run these migrations at organisations ranging from 50 to several thousand users — with structured pre-migration assessment, hybrid coexistence where needed, and zero-downtime cutover planning. We also handle legacy SharePoint customisations that don’t translate natively to the modern SharePoint Online model.
Google Workspace to Microsoft 365
Migrating from Google Workspace involves moving Gmail to Exchange Online, Google Drive to SharePoint and OneDrive, Google Meet workflows to Microsoft Teams, and Google Contacts and Calendar to Outlook. The technical migration is achievable — the harder work is the mental model shift. Google and Microsoft organise collaboration differently, and your team needs more than a new login. Antares runs structured adoption programmes alongside Google migrations: role-specific training, champion networks, and a 30-day post-migration support window that prevents the immediate drift back to old habits.
Tenant-to-tenant migration
Moving users, mailboxes, SharePoint sites, Teams, and data from one Microsoft 365 tenancy to another — typically as the result of a merger, acquisition, rebrand, or organisational restructure. Both tenants are live during the migration, which creates complexity around email routing, calendar sharing, and permissions. Antares plans tenant-to-tenant migrations with carefully staged batches, dual-delivery mail flow during coexistence, and a cutover sequence that keeps disruption to a minimum. We’ve run these for restructuring organisations and post-acquisition integrations where speed and business continuity both mattered.
Other platforms to Microsoft 365
Organisations running Dropbox, Box, Slack, Zoom, Lotus Notes, Novell GroupWise, or custom intranet platforms often need a migration path to Microsoft 365 as part of a broader consolidation. Each source platform has its own extraction tooling, metadata considerations, and adoption challenges. Antares assesses the source environment first — understanding what needs to move, what metadata can be preserved, and what the team will need to work effectively in the new environment — before scoping or commencing the migration.
SharePoint Online uplift and content remediation
Not every migration is a full platform change. Many organisations already have SharePoint Online but need to remediate years of unstructured content — replacing folder-heavy libraries with metadata-driven architecture, consolidating team sites, cleaning duplicates, re-applying permissions, and establishing governance that was never in place. This is particularly common after a rapid cloud migration done under time pressure, or after years of organic SharePoint growth without a governing framework. Antares treats this as a migration project in its own right: assess, remediate, restructure, govern.
Microsoft 365 Copilot only works well on a clean, governed tenancy
If your organisation is planning a Microsoft Copilot deployment, the state of your Microsoft 365 environment matters enormously. Copilot surfaces information from wherever it can find it — which means oversharing permissions, unstructured content, and stale data all become Copilot problems. A well-scoped migration and content remediation project is also Copilot readiness work. Antares plans these together wherever possible so the investment does double duty.
Moving data is the easy part. Everything else is the hard part.
Most migration projects underestimate the non-technical work. The tooling to move emails and files is well established. What takes judgment — and experience — is everything that surrounds it.
Pre-migration remediation
The single biggest determinant of post-migration satisfaction is the quality of what moves. Most environments have 20–40% content that should be archived or deleted rather than migrated. Remediating before migration reduces cutover time, storage costs, and the confusion your team will encounter on day one. We build this into every project scope.
Permissions and identity
Legacy on-premise environments often have permissions accumulated over years that nobody fully understands. Migrating them as-is creates oversharing and compliance exposure in the new environment. Antares maps, rationalises, and re-establishes permissions aligned to Microsoft Entra ID and modern Microsoft 365 security groups — so your new environment is secure from the first day of operation.
Adoption and change management
A migration that completes on time and on budget with zero data loss can still fail if your team doesn’t use the new environment well. We’ve seen organisations spend months on a migration, then watch staff revert to emailing attachments because nobody explained how SharePoint’s sharing model actually works. Antares runs structured adoption programmes for every major migration — role-specific training, champion networks, and a post-migration support window.
Post-migration governance
Getting to Microsoft 365 is only valuable if the new environment is governed from the start. Retention policies, DLP rules, sensitivity labels, Teams governance frameworks, and SharePoint information architecture need to be in place before people start creating content — not retrofitted six months later when the new environment has already grown in the same unstructured way as the old one.
Assess first, migrate second.
Every Antares migration begins with a structured assessment — because the quality of what you discover before you start determines the quality of what you end up with. We don’t quote a migration until we know what’s there.
Pre-migration assessment
Fixed fee
We inventory your current environment — email, files, SharePoint, permissions, integrations. Clear findings. We tell you exactly what you have before you commit to moving it.
Remediation and planning
Before the build
We identify what to migrate, what to archive, what to leave behind, and what needs restructuring. We design the target environment — information architecture, permissions, governance — before migration begins.
Staged migration
Structured batches
Migration runs in structured batches with validation at every stage. Cutover is planned with clear rollback positions. Your team is briefed before each wave. No surprises at midnight.
Validation and cutover
Evidence-based sign-off
Item-level validation confirms zero data loss. Parallel environments are maintained through the cutover window. Sign-off is based on evidence, not assumption.
Adoption and handover
Post-migration window
Role-specific training, champion programmes, and a post-migration support window. We stay engaged until your team is genuinely working in the new environment — not just technically migrated to it.
Microsoft 365 migration services, end to end.
From pre-migration assessment through to post-migration adoption support, Antares covers every dimension of a successful Microsoft 365 migration.
Pre-migration assessment
A structured inventory of your current environment — what exists, where it lives, who owns it, what needs to move, and what needs remediation. Fixed fee. Clear deliverables. The foundation for every migration we run.
Exchange Online migration
Migration from on-premise Exchange (2010, 2013, 2016, 2019) or from other mail platforms to Exchange Online — with shared mailboxes, distribution groups, calendar resources, and public folders all accounted for and tested before cutover.
SharePoint Online migration
Migration from on-premise SharePoint, file servers, or other document platforms to SharePoint Online — with metadata mapping, content type configuration, and information architecture designed for how your organisation actually works.
Microsoft Teams migration and setup
Migration of team collaboration from Slack, Zoom, or on-premise environments to Microsoft Teams — with Teams governance frameworks, channel structure, and lifecycle management built in from the start.
OneDrive migration
Migration of personal file stores, home drives, and My Documents from on-premise or legacy storage to OneDrive — with Known Folder Move configuration and decommissioning planning for the legacy file server.
Google Workspace migration
End-to-end migration from Google Workspace — Gmail, Drive, Meet, Calendar, Contacts — to Microsoft 365, with structured adoption support that accounts for the mental model shift your team needs to make, not just the technical move.
Tenant-to-tenant migration
Planned, staged migration between Microsoft 365 tenancies — managing dual-delivery mail flow, coexistence periods, Teams federation, and SharePoint access during the transition. Structured for mergers, acquisitions, and organisational restructures.
Content remediation and uplift
Pre-migration cleanup of duplicated files, stale content, and legacy archive material — reducing migration scope, storage cost, and the confusion your team encounters in the new environment. We identify what to move, what to archive, and what to retire.
Post-migration governance setup
Retention policies, DLP rules, sensitivity labels, Teams governance frameworks, and SharePoint information architecture — established at migration, not retrofitted later when the new environment has already grown in the same unstructured way as the old one.
Adoption and change management
Role-specific training, champions programmes, and a structured communication plan for every major migration. We treat adoption as a deliverable — not an optional add-on — because the technology investment is only valuable if your people actually use it.
Post-migration managed services
Ongoing Microsoft 365 environment support after migration completes — helpdesk, enhancement delivery, governance uplift, Copilot readiness support, and proactive platform health monitoring on a flexible monthly model.
Microsoft Copilot readiness
Migration is an ideal time to build the information architecture and permissions model that Microsoft 365 Copilot needs to work well. Antares plans Copilot readiness into the migration design — so you’re not doing the same work twice twelve months later.
Migration specialists, not generalists.
We work exclusively in the Microsoft stack. Our consultants have delivered Microsoft 365 migrations for organisations from 50 to several thousand users, across every major source platform, in sectors with real compliance obligations. That depth changes the questions we ask — and the things we catch before they become problems.
| What matters in a migration | Antares Solutions | Generic IT partner | Internal team, unaided |
|---|---|---|---|
| Pre-migration assessment before quoting | ✓ Always | △ Sometimes | ✕ Rarely |
| Content remediation before migration | ✓ Built in | △ Optional add-on | ✕ Usually skipped |
| Zero data loss, item-level validation | ✓ Non-negotiable | △ Varies | ✕ Hard to guarantee |
| Post-migration governance (retention, DLP, labels) | ✓ Included | △ Separate engagement | ✕ Rarely done |
| Structured adoption programme for staff | ✓ Included | △ Optional | ✕ Usually just email |
| Microsoft Copilot readiness built into architecture | ✓ By design | △ Varies | ✕ Not considered |
| Managed service to support the environment afterwards | ✓ Available | △ Varies | △ Internal team only |
Sector experience that changes the questions we ask.
Every sector has different compliance obligations, different data sensitivities, and different adoption challenges. Our consultants have run migrations across all of these — which means we anticipate the issues before they surface, not after.
“Antares are a vendor that don’t ‘sell’ for the sake of selling. They truly want the best outcome for the client and will advise us against decisions that would do more harm than good — regardless of the outcome for themselves.”
Digital Systems and Solutions Lead — Catholic Schools Broken Bay
Start with a pre-migration assessment.
The best way to scope a Microsoft 365 migration is to understand what you actually have first. Our pre-migration assessment gives you a clear picture of what needs to move, what needs remediation, and what the migration would realistically involve — before you commit to anything.
Fixed fee. Clear deliverables. No open-ended commitment. If you’d rather just have an initial conversation about your situation, that’s fine too.
Questions we hear from every organisation.
Timelines vary significantly based on the size of the environment, the source platform, and the complexity of what needs to move. A small organisation migrating from Google Workspace might complete in four to eight weeks. A large enterprise moving from on-premise Exchange and SharePoint, with multiple file servers and legacy systems, might take three to six months. The most important factor is the pre-migration assessment — understanding what you have before you start is what determines whether the migration runs to plan or unravels midway through.
Yes. Antares has migrated organisations from Google Workspace to Microsoft 365, covering Gmail to Exchange Online, Google Drive to SharePoint and OneDrive, Google Meet to Microsoft Teams, and Google Contacts and Calendar to Outlook. The technical migration is only part of the work — Google and Microsoft have different mental models for how they organise email, files, and collaboration, and your team needs structured training and change management to adopt the new environment effectively.
Almost always yes. Most organisations have years of accumulated duplication, stale files, and obsolete email that will slow the migration, inflate storage costs, and undermine adoption in the new environment. In our experience, 20–40% of content in a typical legacy environment should be archived or deleted rather than migrated. Antares builds pre-migration remediation into every project scope — identifying what to migrate, what to archive, and what to leave behind before any data moves.
A tenant-to-tenant migration moves users, data, and configuration from one Microsoft 365 tenancy to another — typically as the result of a merger, acquisition, rebrand, or organisational restructure. It is technically complex because both environments are live during the migration, email flows need to be managed carefully to avoid disruption, and permissions, groups, and shared resources need to be re-established in the destination tenant. Antares plans and executes tenant-to-tenant migrations with structured cutover planning and minimal disruption to day-to-day operations.
Zero data loss is a non-negotiable on every migration Antares delivers. Our methodology includes pre-migration inventory and validation, parallel environment running during cutover, item-level verification post-migration, and documented rollback planning at every stage. We do not begin a cutover without a validated fallback position. We also don’t close a migration project until post-migration validation confirms that everything that should have moved did move — correctly.
Yes — and this is a common request. Many organisations moved to Microsoft 365 under time pressure, or migrated incrementally without a coherent architecture, and are now dealing with a sprawling environment that doesn’t work as well as it should. Antares treats SharePoint remediation, content uplift, and governance retrofitting as a project in its own right: assess what exists, design the target architecture, restructure and migrate content within the tenancy, and put governance in place that was never there before.