I'm moving 8 users from one domain to another on Google Apps with the Migration tool that is available on the administration panel, but can't find information on this:
When migrating mail, will the migration process remove the email from the users at the old domain? or will it just copy the email to the new domain?
Best Answer
It copies the mail. You can stop and resume the process, and migrate again to recover any mail received while the process was active; it won't duplicate existing mail. You can also set the starting date from which the mail will be migrated.