Northern Trail Outfitters uses separate Marketing Cloud accounts as environments for development, UAT, and production.

Marketing Cloud ' s Package Manager is the AppExchange-listed extension product specifically built to bundle and migrate Marketing Cloud assets — including data extensions, journeys, automations, and related configuration — across separate Marketing Cloud accounts representing different environments (development, UAT, production), which directly addresses the deployment pipeline NTO has established across its three isolated account environments. Because entirely separate Marketing Cloud accounts (rather than Business Units within one account) don ' t share a native built-in migration path the way Change Sets do within a single Salesforce org, a dedicated tool purpose-built for cross-account Marketing Cloud asset migration is required, and Package Manager fills that role. Change Sets (D) are a Salesforce Sales/Service Cloud deployment mechanism for metadata migration between connected Salesforce orgs and sandboxes — they do not migrate Marketing Cloud-native objects like journeys and data extensions between separate Marketing Cloud accounts. The Ant Migration Tool (B) is likewise a Salesforce Salesforce.com metadata deployment utility for Apex/Visualforce-style development, unrelated to Marketing Cloud asset migration. ' Configuration Manager ' (C) is not a recognized Salesforce Marketing Cloud product name. Reference: Marketing Cloud Package Manager, Multi-Environment Deployment Strategy.