As U.S. defense contractors prepare for CMMC 2.0 certification, securing Controlled Unclassified Information (CUI) is essential. Microsoft GCC (Government Community Cloud) and GCC High provide secure Microsoft 365 environments designed to meet FedRAMP and DoW compliance standards. This guide explains the differences between Microsoft GCC and GCC High, how they support CMMC 2.0 compliance, and how CTI can help your organization implement the right solution. Since 1985, companies have turned to CTI for advanced IT solutions that empower teams, secure data, and streamline operations.
Frequently Asked Questions about Microsoft GCC and GCC-High
What is Microsoft GCC and GCC-High?
Microsoft GCC (Government Community Cloud) is a specialized version of Microsoft 365 built for U.S. government agencies and contractors that handle FCI and CUI data. GCC High offers additional isolation and compliance for ITAR and DoW IL4/5 requirements.
How do you keep your information safe while meeting compliance standards?
Why Microsoft GCC and GCC High?
- Built for compliance: Specifically developed to meet Federal Information Security Modernization Act (FISMA) and FedRAMP High baselines.
- Secure collaboration: Enables teams to share and access data safely within controlled environments.
- Trusted by the DoW: Approved for handling Controlled Unclassified Information (CUI) and Federal Contract Information (FCI).
- Scalable integration: Works across your organization to strengthen data protection without slowing productivity.
Exploring the Differences between Microsoft GCC and GCC High
| Feature | Microsoft GCC | Microsoft GCC High |
|---|---|---|
| Infrastructure | Azure Commercial | Azure Government (Sovereign Cloud) |
| Compliance Level | FedRamp Moderate | FedRamp High |
| DoD Impact Level | DISA IL2 | DISA IL4 |
| ITAR/EAR Support | Yes | No |
| Data Residency | U.S. (at rest) | U.S. (at rest & in processing) |
| Support Personnel | Global (potential access) | Screened U.S. persons only |
| CMMC Level 2 Suitability | For "Basic" CUI only | Recommended for all CUI/ITAR |
| Feature Parity | High (similar to Commercial) | Delayed (new features arrive later) |
Important Considerations for Deciding Which to Use
- Export-Controlled Data (ITAR/EAR):If your contracts involve International Traffic in Arms Regulations (ITAR) or Export Administration Regulations (EAR), GCC High is mandatory. The standard GCC environment does not restrict support personnel to “US Persons,” which is a requirement for export-controlled data.
- Data Sovereignty: In GCC High, all data processing and support occur within the U.S. In standard GCC, while your data is stored in the U.S., some processing or support may still involve global infrastructure.
- Attempt to Save Ends Up Costing More: Many organizations start in GCC to save costs but eventually move to GCC High as they win more sensitive contracts. This requires a full tenant-to-tenant migration, which is often more expensive and disruptive than starting in GCC High from the beginning.
- Cost & Licensing: GCC High is significantly more expensive—often 30–40% higher than commercial or GCC licenses—and requires a formal validation process through a licensed Agreement for Online Services Government (AOS-G) partner.
How CTI Puts Microsoft Tools to Work for You
Through our four-step LevelUp Process, CTI configures your Microsoft GCC or GCC High environment to align with your organization’s needs and compliance goals. Our certified experts guide you through every step, ensuring your infrastructure meets all technical and security standards required for certification.
On November 10, 2025, the DoD’s final CMMC rule took effect, bringing new cybersecurity requirements to defense contracts.
Don't wait to secure your systems and stay competitive within the DoD supply chain!
More about CMMC 2.0 Compliance
Complete Guide to CMMC 2.0 Certification
CMMC 2.0 certification ensures that organizations meet the DoD’s strict cybersecurity requirements, and the introduction of three CMMC 2.0 levels makes it easier for contractors to understand and meet these needs.
CMMC Timeline: Key Dates and Milestones
