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Google Workspace automated batch mail migration overview

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:

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
Mail vacation settings, automatic reply settings
Meeting rooms room bookings
Calendar shared calendars, event colors
Contacts Gmail tags, contact URLs, custom tags

CSV files for migration

Manage migration batches in Exchange admin center

Next steps

Migrate mail from Google Workspace to Microsoft 365 (automated method)