Microsoft 365 to Google Workspace Migration: A Practical Guide for SMEs.

Moving from Microsoft 365 to Google Workspace can help SMEs simplify collaboration, reduce platform complexity, and support more cloud-native ways of working. But migration should not start with moving mailboxes and files. It should start with readiness.

Google Workspace is no longer just an alternative to Microsoft 365. With over 3 billion users and more than 13 million customers, it has become a mainstream productivity and collaboration platform for businesses of different sizes. For SMEs, the question is not only whether Google Workspace can replace Microsoft 365, but whether the business is ready to migrate email, files, identity, permissions, and user workflows without disruption.

A successful migration is not just about moving email from Outlook to Gmail or files from OneDrive to Google Drive. It also involves identity, access, security, file permissions, user adoption, compliance, and post-migration support.

Why SMEs move from Microsoft 365 to Google Workspace

For SMEs, the decision to move from Microsoft 365 to Google Workspace is usually not just about email. It is about simplifying how teams communicate, collaborate, share files, and secure access. With Google reporting over 3 billion Workspace users and more than 13 million customers, the platform has become a serious option for businesses that want a cloud-native productivity environment.

Businesses may consider Google Workspace for several reasons: simpler collaboration, Gmail-first communication, browser-based productivity, easier real-time document editing, lower IT administration overhead, or a desire to standardize on Google’s cloud-native tools.

But switching platforms can also create disruption if the migration is rushed.

Before moving, SMEs should ask:

• What data must be migrated before go-live?
• What can remain archived or read-only?
• Which users need early access for testing?
• What Microsoft 365 features are business-critical today?
• What security controls must be recreated in Google Workspace?

What can be migrated?

A Microsoft 365 to Google Workspace migration may include:

Microsoft 365 source	Google Workspace destination
Exchange Online email	Gmail
Outlook calendars	Google Calendar
Outlook contacts	Google Contacts
OneDrive files	Google Drive / My Drive
SharePoint libraries	Google Shared Drives
Distribution lists / groups	Google Groups
Some Microsoft Office files	Drive with Office file editing or Google Docs formats

Not every Microsoft 365 feature transfers neatly into Google Workspace. Email, calendars, contacts, and files are usually the core areas of migration, but permissions, shared mailboxes, file versions, labels, folder structures, and collaboration workflows require additional planning.

Start with migration discovery

Before migration, SMEs should perform a discovery exercise. This means reviewing:

• Number of users and active mailboxes
• Shared mailboxes
• Mailbox sizes and old archives
• OneDrive and SharePoint file volume
• Folder structures and permissions
• External sharing settings
• Existing Microsoft Teams usage
• Compliance, retention, and legal hold requirements
• Identity provider and MFA setup
• Devices and browser readiness

This discovery process helps define what should be migrated, when it should be moved, and what can remain behind. In many cases, SMEs do not need to migrate every file or mailbox before go-live. Older files, inactive archives, and rarely used content can often be migrated later or kept as read-only legacy data.

Choose the right migration approach

Google’s migration guidance recommends a phased approach rather than a big-bang migration. For larger migrations, Google suggests moving through phases such as core IT, early adopters, and go-live, while also identifying the data users need to be productive on day one. This helps reduce disruption, test the migration process, and avoid moving unnecessary legacy data too early.

There are several ways to migrate from Microsoft 365 to Google Workspace. For smaller migrations, Google’s data import options may be enough for email, calendar, and contacts. For more complex migrations, Google Workspace Migrate or third-party migration tools may be needed, especially when SharePoint, OneDrive, permissions, and large volumes of data are involved.

A practical SME migration path often looks like this:

Planning and discovery
Understand users, data, security, and business requirements.

Pilot migration
Start with IT or a small group of early adopters.

User training and communication
Prepare users for Gmail, Calendar, Drive, Meet, Chat, Docs, Sheets, and Slides.

Core migration
Move priority email, calendar, contacts, and files.

Go-live
Switch users to Google Workspace for daily work.

Post-migration cleanup
Validate migrated data, review security, fix permissions, and support users.

Security considerations before switching

Migration is also a security project. Google’s identity guidance recommends using managed Google Accounts because they allow organizations to enforce security policies, administer accounts centrally, audit and monitor account activity, use SSO with third-party identity providers, and manage devices. For SMEs moving from Microsoft 365 to Google Workspace, this means identity planning should happen before users are provisioned, not after the migration is already underway.

Google’s zero trust guidance also highlights security planning across identity, devices, applications, and data, making post-migration hardening just as important as the migration itself.

Important security questions include:

• Will Google Workspace use Cloud Identity, Microsoft Entra ID, Okta, or another identity provider?
• Will MFA or 2-Step Verification be enforced?
• Are there unmanaged Google Accounts using the company domain?
• Are third-party apps allowed to access Google Workspace data?
• How will external sharing be controlled in Drive?
• What DLP, retention, and audit log settings are required?
• Which devices should be allowed to access company data?

This step is especially important because unmanaged or conflicting Google accounts can create migration and ownership issues if they are not handled before provisioning users.

Plan for File and Permission Differences

One of the biggest migration mistakes is assuming OneDrive and SharePoint permissions will behave exactly the same in Google Drive and Shared Drives. They do not.

Shared Drives are powerful for team ownership, but SMEs must review folder structure, file ownership, external sharing, and restricted permissions before migration. Some SharePoint structures may need to be simplified before moving into Google Drive.

This is why a migration readiness review should include both technical discovery and business workflow review.

Plan the Move, Secure the Destination

For SMEs, a Microsoft 365-to-Google Workspace migration should not be treated as a simple copy-and-paste project. The better approach is:

Assess → Plan → Pilot → Migrate → Secure → Support

Assess your current Microsoft 365 environment first. Plan the right migration path. Pilot with a small group. Migrate the data users need most. Secure Google Workspace immediately after go-live. Then support users as they adjust to new workflows.

The goal is not just to switch platforms. The goal is to reduce friction, protect business data, and help teams collaborate more effectively.

Need help planning your migration?

Reputiva helps SMEs assess Microsoft 365 and Google Workspace environments, plan secure migrations, review identity and access controls, and strengthen productivity-platform security.

Book a consultation to review your migration readiness before switching from Microsoft 365 to Google Workspace.