This document compares editions of Windows Server 2012 R2 and related products. It lists features such as maximum users, RAM, server roles, and features for editions including Windows Server 2012 R2 Datacenter, Standard, Essentials, Foundation, Hyper-V Server 2012 R2, and Windows Storage Server 2012 R2 Standard and Workgroup. Key differences between editions are related to licensing limits, supported server roles and features, and virtualization capabilities.