Google Drive to Microsoft 365 Migration in Australia (2026) — Why Basic Tools Create Security Gaps

Migrating from Google Drive and Google Workspace to Microsoft 365 is one of the most common cloud migrations Australian SMEs undertake in 2026 — but basic Google migration tools like Google Takeout and manual export processes create significant data loss, broken permissions, and security gaps that leave businesses exposed. Mycelium 365 provides enterprise-grade Google Drive migration services for Australian businesses, ensuring data integrity, permission preservation, and security compliance throughout the transition.

Why Australian businesses are moving from Google Workspace to Microsoft 365 in 2026

Three drivers are pushing Australian SMEs off Google Workspace in 2026. The first is Microsoft 365 Copilot. Google Workspace has no equivalent enterprise AI deployment at the same maturity — Copilot for Microsoft 365 is the clear leader for SMB AI productivity, and it only works with SharePoint, OneDrive, and Exchange data. Businesses serious about AI cannot stay on Google.

The second is security architecture. Microsoft's security stack — Defender for Endpoint, Entra ID, Intune, Purview — is significantly deeper than Google Workspace's controls, and Australian cyber insurance providers are increasingly asking specifically about Microsoft Defender coverage during renewal.

The third is compliance and procurement. Australian government and enterprise procurement increasingly specifies Microsoft 365 as the required productivity platform for suppliers, particularly in defence, professional services, and critical infrastructure sectors. IDC reports 34% of Australian SMEs on Google Workspace plan to migrate to Microsoft 365 within 24 months.

What makes basic Google migration tools dangerous for Australian SMEs?

Basic tools like Google Takeout and manual drag-and-drop create four critical failures:

• Google-native format conversion loss — Takeout exports Google Docs as .docx, Sheets as .xlsx, and Slides as .pptx at the point of export. Formatting, embedded objects, comments, and revision history are frequently lost or corrupted in conversion. For professional services firms with years of client documents, proposal templates, and financial models in Google Docs, this is a material business risk.
• Permissions are not preserved — Google Drive uses a sharing model based on individual Gmail addresses. When files are exported and re-uploaded to SharePoint, all permission information is lost. Files either become fully private (breaking access) or fully public (creating exposure) depending on destination settings.
• Shared Drive structures are flattened — Google Shared Drives should map to SharePoint Sites, but basic tools dump all files into a single document library, destroying the folder hierarchy and making files difficult to find post-migration.
• External sharing links break immediately — any Google Drive links shared with clients, partners, or suppliers stop working the moment the migration begins. Without a planned transition, businesses are left with broken links across emails, contracts, and project documentation with no automated way to identify or replace them.

Migrating from Google Workspace to Microsoft 365? Book a free migration assessment — we'll audit your Google environment, identify the risks, and provide a fixed-price quote within 5 business days.

The hidden data loss risks in Google Drive migrations

Beyond the obvious issues, five specific data loss scenarios routinely catch out businesses using basic tools:

• Google Forms — Google Forms and their response data are not exportable via standard migration tools. Any forms used for client intake, staff surveys, or project checklists need to be rebuilt in Microsoft Forms before the migration.
• Google Sites — internal company intranets built on Google Sites cannot be migrated to SharePoint automatically. They need to be manually rebuilt or the content extracted and restructured.
• Files shared with you (not owned by you) — Google Takeout only exports files owned by the exporting account. Files that team members have shared with each other but not transferred are silently left behind. In a 50-person business, this can represent thousands of files that appear to have migrated but are actually missing.
• Large file limits — Google Drive supports files up to 5TB. SharePoint's individual file size limit is 250GB. Files exceeding this limit fail silently without basic tooling, creating unexplained gaps post-migration.
• Google Vault compliance data — businesses using Google Vault for eDiscovery or compliance holds need to export and preserve this data separately before migration — it is not included in standard Google Drive exports and cannot be migrated to Microsoft Purview automatically.

How a secure Google Drive migration strategy works — step by step

Step 1: Discovery and risk assessment. Audit the Google Workspace environment — total data volume, number of users and Shared Drives, file format distribution (Google-native vs uploaded files), external sharing links, Google Forms, Google Sites, and any Google Vault compliance holds. Identify migration blockers before the migration starts.

Step 2: Design the Microsoft 365 information architecture. Map Google Shared Drives to SharePoint Sites, define document libraries and folder structures, design the Entra ID security groups that will replace Google group sharing, and plan the sensitivity labelling and DLP policies that will govern the SharePoint environment post-migration. This step determines the quality of the Microsoft 365 environment for years — it is not optional.

Step 3: Format conversion and pre-migration remediation. Convert Google-native files to Microsoft formats using purpose-built tooling that preserves formatting, comments, and revision history more reliably than Google Takeout. Identify and remediate files with unsupported SharePoint characters, paths exceeding 400 characters, and files exceeding the 250GB size limit.

Step 4: Run migration using enterprise-grade tooling. Use Microsoft's Migration Manager (in the Microsoft 365 admin centre) for Google Workspace migrations — it handles Google Drive natively, preserves folder structures, and maintains file metadata and timestamps. For larger environments, ShareGate or AvePoint provide more granular permissions mapping and delta migration. Never use Google Takeout for a business migration.

Step 5: Permissions mapping and validation. Map Google Drive sharing permissions to SharePoint permissions using Entra ID security groups. Validate that no files have been migrated with overly permissive settings and that restricted files are accessible only to the correct team members. Apply sensitivity labels to confidential document libraries as part of the permissions validation step.

Step 6: Gmail to Exchange Online migration. The email migration typically runs in parallel with the file migration. Use Microsoft's Exchange migration tooling to migrate Gmail mailboxes to Exchange Online, preserving emails, contacts, and calendar events. The MX record cutover should be scheduled separately from the file migration cutover to avoid compounding disruptions.

Step 7: Google Workspace decommission. Once users have confirmed access to files and email in Microsoft 365, set a Google Workspace decommission date. Cancel Google Workspace licences only after decommission — maintaining read-only Google Workspace access for 2–4 weeks post-migration reduces the risk of discovering missing files after licences have been cancelled.

Google Drive permissions vs SharePoint permissions — the critical differences

Google Drive uses an individual sharing model — files and folders are shared with specific Gmail addresses or Google Groups. SharePoint uses a site-based model integrated with Entra ID — access is managed through security groups, not individual email addresses.

The key mapping: Google Shared Drives → SharePoint Sites, Google Folders → SharePoint document libraries or folders, Google Groups → Entra ID security groups, Google Drive sharing links → SharePoint sharing links with expiry dates.

The critical governance improvement: in SharePoint, all permissions are visible and manageable from a central admin console. In Google Drive, permissions are fragmented across thousands of individual files and folders, making it nearly impossible to audit who has access to what. The migration is the opportunity to fix years of permission sprawl and establish a governed SharePoint environment from day one. For the ongoing discipline that keeps this in place, see our guide to managed SharePoint governance and permissions.

Data loss prevention during a Google Drive migration — what Australian SMEs need to configure

Four DLP controls must be in place in Microsoft 365 before or during the migration — not retrofitted afterwards:

• Sensitivity labels in Microsoft Purview — applied to confidential document libraries at migration, so labels travel with the files from day one.
• DLP policies — blocking the sharing of files containing Australian Tax File Numbers, financial account numbers, and health records outside the organisation.
• External sharing controls in SharePoint admin — setting appropriate external sharing levels before files arrive, not after users have already reshared them.
• Entra ID Conditional Access — ensuring only managed, compliant devices can access SharePoint from day one of the migration.

The ASD notes that data migration events are a high-risk period for data exposure — temporary sharing settings applied during migration are frequently left in place permanently, creating ongoing security gaps.

How long does a Google Workspace to Microsoft 365 migration take?

For a typical 20–50 user Australian SME migrating from Google Workspace to Microsoft 365, the total project timeline is 4–8 weeks — 1–2 weeks for discovery and information architecture design, 1 week for pre-migration remediation and format conversion, 1–2 weeks for the file and email migration (run overnight to minimise disruption), and 1 week for validation, user training, and Google Workspace decommission planning.

Larger environments (100+ users or 5TB+ data) typically require 8–14 weeks. The migration timeline is driven more by planning and remediation than by data transfer speed — enterprise tooling can migrate 1TB per day, but poor planning can turn a 2-week migration into a 3-month remediation project.

Mycelium 365 provides a fixed-price Google Workspace to Microsoft 365 migration scoped from a free discovery assessment. For the broader migration picture across platforms, see our Microsoft 365 migration guide for Australian businesses in 2026, and if you're comparing platforms, our Dropbox to Microsoft 365 migration guide.

Google Drive migration and Microsoft 365 Copilot — the AI readiness connection

Microsoft 365 Copilot cannot access files stored in Google Drive — it only works with content in SharePoint, OneDrive, Teams, and Exchange Online. For Australian SMEs planning to deploy Copilot, completing the Google Drive migration to SharePoint is a non-negotiable prerequisite.

More importantly, how the SharePoint environment is structured during the migration directly determines Copilot's effectiveness. A well-structured SharePoint with correct permissions, sensitivity labels, and information architecture allows Copilot to surface the right documents reliably. A migration that dumps Google Drive files into SharePoint without governance produces an AI environment where Copilot surfaces confidential documents to the wrong staff and cannot reliably distinguish between current and superseded versions of documents.

The migration is the single best opportunity to set up SharePoint correctly for AI from the start. If you're planning ahead, read our AI readiness guide for Australian businesses or book an AI Readiness Assessment.

How Mycelium 365 manages Google Drive migration services for Australian SMEs

Mycelium 365 delivers end-to-end managed Google Workspace to Microsoft 365 migrations — discovery and risk assessment, information architecture design, format conversion, enterprise migration tooling, permissions mapping and DLP configuration, Gmail to Exchange Online migration, and 30 days of post-migration hypercare. Delivery is remote-first across Melbourne, Sydney, Brisbane, Perth, Canberra, and Adelaide, with senior Australian consultants leading every engagement.

All projects are fixed-price with a Microsoft-first approach and no lock-in contracts. Contact us to book a free discovery assessment, or read the broader Microsoft 365 migration guide for Australian businesses.