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The batch migration tool in the Exchange Admin Center can transfer your organization's mail, rules, calendars, and contacts from Google Workspace to Microsoft 365. Microsoft recommends using the automated method because it completes several required tasks in your Google admin console for you.
Note
Google Workspace migration is not currently available for Office 365 US Government, GCC High, or DoD.
Important
We strongly recommend disabling all messaging records management (MRM) tools and archival policies before attempting any data migration. Tools that enforce MRM and archival policies cause perceived data loss when no actual data loss has occurred. Archiving or deleting messages also result in items flagged as "missing" during the verification checks.
Prerequisites
Before attempting an automated migration, you must complete the following prerequisites:
- Prerequisite Step 1 - Create a subdomain in Google Workspace to route mail to Microsoft 365
- Prerequisite Step 2 - Create a subdomain to route mail to Google Workspace
- Prerequisite Step 3 - Provision mail users to migrate from Google Workspace to Microsoft 365
- Prerequisite Step 4 - Verify Google migration administrator role assignments
Batch migrations
As an Exchange administrator, you can migrate users all at once or in batches. Batch migration is recommended if your organization has many users, which require mail migration to occur in stages. You need to create a CSV file that lists the users you want to migrate for each migration batch. The CSV creation process is covered in later steps.
Tip
If you need to migrate a small number of users, you can migrate them all at once using a PST file.
For an overview of the automated migration process, check out this video:
Migration limitations
The quota restrictions of your Google Workspace tenant service account can determine the throughput limitations for contacts and calendars.
| Data type | Limit |
|---|---|
| Contacts | A maximum of three email addresses per contact are migrated over |
| Email size | Default limit of 35 MB per single email. This size can be configured up to 150 MB. |
What isn't migrated
| Data type | Not migrated |
|---|---|
| vacation settings, automatic reply settings | |
| Meeting rooms | room bookings |
| Calendar | shared calendars, event colors |
| Contacts | Gmail tags, contact URLs, custom tags |
Related articles
Manage migration batches in Exchange admin center