There are updated (April 2025) Microsoft 365 plan comparison documents with a row added for Copilot Chat, and also updated for Microsoft 365 Business Premium as an eligible prerequisite for Microsoft 365 E5 Security (see our blog: https://bit.ly/42JvfVu).

These useful documents tell you which of the (many) different components are included in which Office 365/Microsoft 365 plan, and there’s a table for SMB customers (https://bit.ly/4lRG14X), one for Enterprise customers (https://bit.ly/3YDt9Fl), and still more for specialist US Government customers – one for GCC (https://bit.ly/4cCaMqc), one for GCC High (https://bit.ly/4ihKc73) and the final one for DoD (https://bit.ly/4cEMJXN).