Microsoft 365 Migration— planned, executed, and managed by PIP
Most Microsoft 365 migrations go wrong in the planning. PIP spends 90% of the migration project there — so the cutover itself is the shortest, smoothest part.
Microsoft 365 migration — more than moving mailboxes
Migrating to Microsoft 365 means moving email, files and collaboration tools from an existing environment — on-premises Exchange Server, Google Workspace, a legacy Office 365 tenant, or another email platform — into Microsoft 365 in the cloud. Many organizations attempt an Office 365 migration without careful planning, and the migration fails in the gap between the old system and the new one.
Planning accounts for 90% of the work in a successful Microsoft 365 migration project. PIP manages the entire 365 migration: scoping the current environment, selecting the right migration method, executing the data migration, configuring the Microsoft 365 tenant correctly with proper licensing, and managing the environment ongoing after the migration cutover. PIP is a Microsoft partner — every migration project includes correct tenant configuration and a managed service from day one. Migration to Microsoft 365 delivers a strong ROI: lower infrastructure costs, better collaboration, stronger security and scalable cloud storage that replaces ageing on-premises hardware.
What a Microsoft 365 migration involves
Migrating to Microsoft 365 involves moving email, files and collaboration tools to the Microsoft cloud — Exchange Online for email, SharePoint Online for files, OneDrive for personal data, and Teams for collaboration. Microsoft 365 supports several supported migration scenarios depending on the source environment. Data is fully encrypted during Microsoft 365 migration for security — data encryption is applied throughout the migration process to keep important data safe.
On-premises Exchange Server migration
Migrate mailboxes, contacts, calendar data and public folders from Exchange Server 2013, 2016 or 2019 to Exchange Online. The most common Office 365 migration scenario — migrate email from on-premises Exchange to Microsoft 365.
Exchange Server → Exchange OnlineGoogle Workspace migration
Migrate email, Google Drive files, contacts and calendar data from Google Workspace to Microsoft 365 — migrate mailboxes to Exchange Online and Google Drive to OneDrive and SharePoint Online.
Google Workspace → Microsoft 365Tenant-to-tenant migration
Migrate data between two Microsoft 365 tenants — common in mergers, acquisitions or rebranding. Tenant-to-tenant migration is more complex: Microsoft 365 tenant configuration, user accounts, licences and SharePoint structure must all be recreated in the new tenant target environment.
Microsoft 365 tenant → new tenantIMAP and other platform migration
Migrate email from IMAP-based email systems, hosted email providers and other platforms to Exchange Online in Microsoft 365. The migration method and migration tools differ based on the source, but the result is the same: all mailboxes migrated to Exchange Online in the Microsoft 365 cloud.
IMAP / hosted email → Exchange OnlineThe full Microsoft 365 migration scope covers: migrate mailboxes, contacts, calendar data, public folders, SharePoint content, OneDrive data, and where relevant Teams data and user accounts. Successful migration requires thorough planning to minimise downtime and ensure business continuity during the migration — migrating data without disruption is the goal of every migration project PIP runs.
Five ways to migrate to Microsoft 365
The right migration method depends on mailbox count, source environment complexity, downtime tolerance and whether hybrid environments need to coexist during the Office 365 migration. PIP selects the migration method for each migration project based on the current environment — not a one-size approach.
Cutover migration
Cutover migration moves all mailboxes and data at once — often in a weekend migration window. All user accounts migrate simultaneously to Exchange Online. Microsoft recommends migrating no more than 150 mailboxes at once in a cutover migration.
Best for: under 150 mailboxes, fast migrationStaged migration
Staged migration splits mailboxes into small batches migrated in sequence over days or weeks. Users in earlier batches are on Exchange Online while later batches are still on Exchange Server — the migration runs in stages until all mailboxes have been migrated.
Best for: larger Exchange environments, phased rolloutPhased migration
A phased migration spreads users into manageable batches with flexible coexistence between on-premises Exchange and Exchange Online. Similar to staged migration but with more control over the migration schedule and hybrid environments during the transition period.
Best for: mid-size organisations, controlled migrationHybrid migration
Hybrid migration combines on-premises Exchange and Exchange Online in a long-term hybrid environment. Mailboxes migrate between on-premises and cloud as needed over months. Requires Active Directory synchronisation via Entra ID Connect. The most complex migration method but the most flexible for large migration projects.
Best for: large organisations, gradual migrationTenant-to-tenant migration
Tenant-to-tenant migration moves data between two Microsoft 365 tenants — migrating mailboxes, SharePoint content, OneDrive data and user accounts from one Microsoft 365 tenant to another. Common in mergers and acquisitions. More complex than Exchange-based migration because the entire Microsoft 365 tenant structure must be rebuilt in the target environment.
Best for: mergers, acquisitions, rebrandingThe migration plan — where 90% of the work happens
PIP’s Microsoft 365 migration planning process covers every step before any mailboxes or data actually move. A migration plan built on careful planning and thorough preparation is what separates a controlled migration from a disruptive one.
Inventory the current environment
Document every mailbox, data volume, shared folder, public folder and Active Directory configuration in the on-premises or current environment. Understand exactly what is being migrated before selecting a migration method for the migration project.
Evaluate network bandwidth
Calculate upload speeds against the total data volume. Large data migrations can saturate network links if not throttled — evaluating network bandwidth prevents performance bottlenecks during the migration and keeps day-to-day operations running during the transfer.
Select the migration method
Choose between cutover migration, staged migration, hybrid migration or tenant-to-tenant migration based on mailbox count, downtime tolerance and source environment complexity. The migration method selection drives the entire migration plan and timeline.
Establish security and licensing
Configure Microsoft 365 security settings, assign proper licensing to all user accounts, and apply data encryption before any migration begins. Data security needs to be evaluated for retention and compliance — security is a prerequisite of migration, not an afterthought. Resource allocation for the migration team is confirmed at this step.
Run a pilot migration
Migrate a small group of mailboxes first. A pilot program identifies migration issues — mailbox errors, data mapping problems, permission gaps — before the larger migration rollout begins. Identify stakeholders to define business goals and compliance requirements for the full migration.
Create a communication plan
End users need to know when their migration window is, what changes, and what to do if there are issues during the migration. User training helps employees adjust to Microsoft 365 after the migration — PIP provides migration communication templates and coordinates training as part of every migration project.
Plan the DNS cutover
The DNS cutover is the moment email routing switches from the old system to Exchange Online — the most critical step in any email migration. Timing must be precise to maintain continuous email access during the migration. PIP plans and executes the DNS cutover as a controlled event: Exchange Online is confirmed receiving correctly before DNS is switched. Business continuity through the migration cutover is non-negotiable.
The right tools for each migration
Microsoft 365 has native migration tools built into the Exchange Admin Center and Microsoft 365 Admin Center — suitable for simple cutover and staged Exchange migrations. For more complex migration scenarios, third-party migration tools offer advanced features: batch management, migration job reporting, re-synchronisation, and support for non-Exchange sources like Google Workspace and IMAP migration.
The best migration tool depends on the migration scenario — data volume, source environment and migration method all influence which migration tools PIP selects. Third-party tools typically support cutover, staged and hybrid migration methods; some also migrate SharePoint content, Teams data and OneDrive data alongside Exchange mailboxes. All migration tools used by PIP transfer data with encryption — migrating data securely is a baseline requirement.
PIP manages migration jobs end to end: monitoring migration progress, handling errors during migration, re-running failed migration jobs, and confirming every mailbox and dataset has migrated correctly before the migration is signed off. The migration process is PIP’s responsibility — not the client’s.
Microsoft 365 migration — and what comes after
PIP is a Microsoft partner — every Microsoft 365 migration project includes correct tenant configuration, proper licensing, and a managed service that continues after the migration cutover. An Office 365 migration with PIP is not a project handoff. PIP manages the migration and the environment it lands in.
- Current environment inventory: every mailbox, public folder, SharePoint site and Active Directory configuration documented before migration planning begins
- Migration plan and migration method selection based on the actual environment — not a template
- Microsoft 365 tenant built correctly with proper licensing assigned to every user account before migration
- Exchange migration execution: all mailboxes, contacts, calendar data and public folders migrated to Exchange Online
- SharePoint Online and OneDrive migration: migrate content from on-premises SharePoint or Google Drive to the Microsoft 365 cloud
- Entra ID (Active Directory) configuration and security baseline established during the migration
- DNS cutover managed as a controlled event — continuous email access maintained throughout the migration
- User training coordination: migration communication and setup instructions for every staff member
- Post-migration: PIP manages the Microsoft 365 environment as an ongoing Microsoft 365 managed service — user provisioning, security policy, licence management and support continue after migration
The step that catches most migration projects is the DNS cutover — there is a window where mail is in transit between two systems, and if the timing is off, email bounces or disappears into neither. PIP holds the cutover until Exchange Online is confirmed receiving correctly, then cuts DNS in a controlled sequence. We have never lost a client’s email in a migration.
Check Out Our Microsoft 365 Migration Checklist Talk to PIP about your migration
Microsoft 365 migration, answered
What is a Microsoft 365 migration?
A Microsoft 365 migration is the process of moving email, files and collaboration tools from an existing environment into Microsoft 365. The migration typically involves migrating mailboxes to Exchange Online, files to SharePoint Online and OneDrive, and contacts and calendar data to the Microsoft 365 cloud. Common migration sources include on-premises Exchange Server, Google Workspace and legacy Office 365 tenants. Migrating to Microsoft 365 gives organisations access to Exchange Online, SharePoint Online, Microsoft Teams and the full Microsoft 365 services hosted in Microsoft’s cloud.
Can I transfer Office 365 to a new computer?
Yes. Microsoft 365 (formerly Office 365) subscriptions are account-based, not device-locked. To move Microsoft 365 to a new computer, sign in to the new computer with your Microsoft 365 account and install the Office apps — the subscription follows the account. Microsoft 365 supports installation on up to five devices per user. This is different from a business Microsoft 365 migration project, which involves migrating an organisation’s email, mailboxes and data from one environment to Microsoft 365.
What is the migration tool for Microsoft 365?
Microsoft 365 migration uses a combination of Microsoft’s native migration tools (in the Exchange Admin Center and Microsoft 365 Admin Center) and third-party migration tools for more complex migration scenarios. The best migration tool depends on the migration method, data volume and source environment. PIP selects migration tools based on each migration project’s requirements — some migration projects use Microsoft-native migration tools, others use third-party migration tools with advanced reporting, migration job management and re-synchronisation features for migrating large volumes of mailboxes and data.
What are the different types of Microsoft 365 migration?
Microsoft 365 (formerly Office 365) supports four main migration methods: cutover migration (all mailboxes at once — best for under 150 mailboxes), staged migration (small batches of mailboxes migrated over time), hybrid migration (on-premises Exchange and Exchange Online running side by side during a longer migration), and tenant-to-tenant migration (migrating from one Microsoft 365 tenant to another). Choosing the right migration method depends on organisation size, mailbox count, downtime tolerance and whether hybrid environments need to coexist during the 365 migration.
On-prem Exchange, Google Workspace, or a legacy tenant?
Whether you’re migrating to Microsoft 365 for the first time or consolidating an existing Office 365 environment — PIP plans and executes the migration end to end.