Data Migration Service (DMS) is the migration tool used to migrate a customer's email environment to a Google Workspace destination environment.
In this AppHelp Knowledge Center, you can find information on DMS by referring to the following articles.
What does DMS Migrate?
To learn more about DMS and a full list of the data that it can migrate, refer to this article:
You will need access the DMS tool through the customer's Google Admin console. For more information, refer to this article:
Setting up a Migration Project in DMS
Depending on the customer's source environment (IMAP vs. Exchange/Microsoft 365), there are different steps that you need to follow to set up the migration project in DMS. For more information, refer to these articles: