What's the difference between Microsoft 365 Business and Enterprise plans under CSP?

Business plans (like Business Basic, Business Standard, Business Premium) are designed for smaller organizations, generally with a cap on the number of licensed users and a more streamlined feature set. Enterprise plans (E3, E5, etc.) scale to any organization size and include more advanced features around compliance, security, and analytics.

The right choice depends on organization size and specific feature needs (e.g. advanced threat protection or compliance tools are more commonly found in Enterprise tiers) rather than one being a strict upgrade of the other in every respect — it's worth reviewing the specific feature comparison for your use case.