Which Salesforce edition must an organization have enabled in order to utilize Entitlement Management features such as Milestones and Entitlement Processes?
Entitlement Management, including Milestones and Entitlement Processes, requires Enterprise Edition or higher. Professional and lower editions lack the entitlement objects entirely, so the organisation must be on Enterprise, Performance, Unlimited or Developer to configure these service-level features.
Why this answer
Entitlement Management is an advanced feature available in specific Salesforce editions, primarily Enterprise, Unlimited, Performance, and Developer editions.