GCC High vs. GCC: What's the Difference?

GCC High and standard GCC are both government-focused Microsoft 365 environments, but they serve different audiences and operate at different security levels. GCC meets FedRAMP Moderate requirements for civilian federal, state, and local agencies, while GCC High meets FedRAMP High requirements for DoD contractors and organizations handling ITAR-controlled or export-controlled data.

The most significant differences are in isolation, compliance scope, and personnel restrictions. GCC is logically separated from the commercial cloud but relies partly on shared infrastructure, while GCC High is physically and logically isolated in Azure Government. GCC does not support ITAR, DFARS 252.204-7012, or CMMC requirements. GCC High does. Support personnel for GCC can be worldwide commercial staff, but GCC High restricts all support to screened U.S. citizens. On the voice side, GCC supports Microsoft Calling Plans, Operator Connect, and Direct Routing for Teams Phone. GCC High supports Direct Routing only, because neither Calling Plans nor Operator Connect meet the data sovereignty and compliance requirements of the GCC High boundary. GCC is the right choice for non-defense government work. GCC High is required when the contract or data type references ITAR, DFARS, or CMMC.