[kazuyamishima]

I agree that the right migration method depends a lot on the number of mailboxes and the amount of data involved. For a couple of users, the manual approach may be manageable, but once you have multiple mailboxes, it can become a time-consuming process.

One thing I would recommend before choosing any migration tool is to clearly define what needs to be moved. If the requirement is only email, the process is simpler. But if you also need attachments, folder structure, metadata, calendars, contacts, or a large amount of historical data, it is worth testing the migration method before moving everything.

Filters can also be useful during a Google Workspace to Microsoft 365 migration. For example, you may not need to migrate every old message, so being able to select specific folders or a date range can reduce the amount of unnecessary data being transferred.

I’d also suggest doing a test migration with a few mailboxes first. Check the migrated emails, folders, attachments, and user mapping before starting the complete migration. This can help identify authentication or permission problems early.

For larger migrations, running multiple jobs or migrating users in batches can also make the process easier to monitor. I’ve been looking at **Kernel GSuite to Office 365 Migration** for this reason. It provides bulk migration along with selective and incremental migration options, which can be useful when dealing with multiple Google Workspace mailboxes.

The main thing I’d avoid is relying on a tool simply because it has a long feature list. A trial or test migration is much more useful because you can see how it handles your actual mailbox data and requirements.

So I’d say the safest approach is to plan the migration, test a few users, verify the results, and then move the remaining mailboxes in controlled batches. That way, whether you choose the manual method or an automated solution, you have a better chance of catching issues before they affect the whole organization.
https://www.nucleustechnologies.com/g-suite-to-office-365/

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