Guide to Migrate from Secondary Google Apps domain to new Primary Google Apps domain
Step-by-step guide to migrate data including emails, drive, contact, calendar and sites from a Secondary Google Apps domain to new Primary Google Apps domain.
Is my domain primary or secondary? Can I migrate my users from our secondary domain to primary? Will I lose any data in this migration?
This guide will help you answers any question that you may have regarding the Secondary to Primary Google Apps domain migration.
Leaving data behind is not an option now.