Cutting Over, Not Cutting Corners: Migrating to Google Workspace
Switching systems isn’t just an IT decision; it affects how people work, collaborate, and communicate every day. Migrating from Microsoft 365 to Google Workspace isn’t only about moving emails and calendars. It’s about doing it in a way that minimizes disruption and helps teams hit the ground running on day one.
This blog outlines the process of planning and executing a Microsoft 365 to Google Workspace migration — including the tools, the timeline, and a few things to watch for. Whether you’re in the early planning stages or just curious how it actually works, this guide will walk you through what to expect.
Why Make the Switch?
Migrating from Microsoft 365 to Google Workspace is often driven by practical needs: simplifying collaboration, reducing dependency on desktop tools, or aligning with cloud-native infrastructure. Regardless of the reason, the success of the migration depends not just on the tools, but on how well the process is planned and executed.
From real-time co-editing in Docs to simplified file sharing in Drive, Workspace offers a streamlined way to work. But as with any major shift, the value comes not just from the destination, but from how you manage the transition.
The Tools That Made It Work
There’s no one-size-fits-all migration tool. The right choice depends on the size of the environment, the systems in use, and the level of data centralization. Here’s what typically works:
- Google Workspace Migrate for moving large sets of email, calendars, files, and contacts from Exchange, SharePoint, Box, or OneDrive.
- GWMMO for smaller, PST-based setups or legacy Exchange environments.
- GCDS or GWSMO for hybrid environments where Active Directory is still active or where some users rely on Outlook.
Each tool serves a specific purpose. Using them in the right combination makes all the difference.
Here’s what the architecture behind Google Workspace Migrate typically looks like. Each component — from Bridge to Nodes — plays a role in managing and scaling large-scale data transfers.
Migration Timeline: A Step-by-Step RolloutSuccessful migrations are never done in a single click. Here’s a phased approach that minimizes friction and gives you time to catch issues before they hit users. 1. Planning & PrepStart with the basics: verify domains, provision users, and define what data will move — and what won’t. Align on timing, responsibilities, and fallback plans. Communicate the migration timeline early, even if the go-live is weeks away. 2. Scan & TestScan the source systems with Google Workspace Migrate to assess data volume, structure, and permissions. Then run test migrations on sample accounts — ideally a mix of simple and complex ones — to validate mappings, speeds, and folder consistency. 3. Bulk MigrationOnce test results look good, initiate the bulk move. This is when the majority of data (email, calendar, files, contacts) gets transferred. It runs in the background and doesn’t affect users yet. Do not update MX records at this stage. 4. MX CutoverAfter bulk migration is complete, update the MX records to redirect mail flow to Gmail. This is the “cutover” point, and it’s best done after hours or over a weekend to reduce disruption. 5. Delta MigrationRun a delta migration after the MX cutover to catch any data received during DNS propagation. Only new, untransferred content is picked up — previously migrated emails won’t be duplicated. 6. Go LiveOnce DNS has propagated and delta migration is done, users can fully switch to Google Workspace. Having a support plan and help desk during this phase is critical to maintaining trust and ensuring a smooth experience. |
What Could Be Done Better
Even well-run migrations can surface small lessons. Some areas worth improving in future rollouts:
- Start end-user communication earlier. Giving teams more time to prepare can reduce confusion and support tickets.
- Automate log monitoring. Manual tracking works, but is time-consuming. Dashboards or simple scripts help stay ahead of issues.
- Include complex user cases in testing. Shared mailboxes, legacy folders, and custom rules are where most edge cases live.
These aren’t failures — just small optimizations that can save hours later.
Lessons Learned: Practical Tips
Here’s what consistently makes a difference in Microsoft 365 to Google Workspace migrations:
- Match the tool to the task. Don’t stretch GWMMO to handle complex file shares — use GWMigrate where it fits.
- Communicate more than you think you need to. Early info reduces late-stage stress.
- Test like it’s real. Include complex users, not just clean ones.
- Buffer your timeline. Especially around DNS, authentication errors, and old PST files.
- Support users on day one. It’s not just about technical success — it’s about the user experience.
Thinking About Making the Move?
If you’re planning to switch from Microsoft 365 to Google Workspace — or just starting to explore what that would involve — it helps to have someone who’s done it before.
At Kartaca, we’ve supported migrations at various scales, from small teams to larger workgroups. Whether you need help choosing the right tools, structuring the process, or handling the final cutover, we can help you make the move with confidence.
Curious about what working with a Google Workspace Partner really adds to the process? Read more here.
If you’re interested in starting your migration journey, get in touch — let’s figure out what your path could look like.
Author: Efe Özpay
Date Published: Apr 25, 2025
