What Is GCC High? The Complete Guide to Microsoft 365 GCC High for DoD and Federal Agencies

Key Takeaways

• GCC High is a specialized Microsoft cloud environment built to meet DFARS 7012, NIST 800-171, FedRAMP High, and ITAR compliance for the U.S. Department of Defense. 
• All data in GCC High is stored in U.S.-based data centers staffed by screened personnel to ensure strict data sovereignty and security. 
• GCC High is often mandatory for defense contractors and organizations handling CUI or ITAR-controlled data to remain eligible for DoD contracts. 
• Migrating to GCC High requires eligibility verification, account re-provisioning, and a phased deployment strategy to maintain compliance. 
• CloudFit is an authorized Microsoft reseller offering competitive prices for GCC High licenses and end-to-end support for migration and CMMC compliance. 

Government organizations and contractors working with the U.S. Department of Defense face some of the most rigorous cybersecurity and compliance requirements in the world. Traditional cloud environments cannot meet these high standards, which is why Microsoft developed GCC High — a specialized cloud environment tailored to safeguard sensitive government data and meet the strictest compliance frameworks. 

For organizations handling Controlled Unclassified Information (CUI) or subject to mandates such as DFARS 7012, NIST 800-171, FedRAMP High, and ITAR, Microsoft 365 GCC High offers the specialized protections and compliance guarantees necessary to work with federal agencies and the broader US government.  

This guide explores everything you need to know about Microsoft GCC High, including its features, benefits, use cases, licensing, and why it’s a requirement for many DoD contractors and members of the Defense Industrial Base. 

What Is GCC High? 

Government Community Cloud High (GCC High) is a secure version of Microsoft’s cloud infrastructure designed exclusively for U.S. government agencies, their contractors, and suppliers who handle sensitive defense data. Unlike Microsoft’s commercial offerings, GCC High is built to meet specialized federal regulations and security protocols, ensuring data residency within U.S. data centers staffed by screened personnel. 

This environment supports compliance with multiple high-level security standards, including DFARS 7012, NIST 800-171, FedRAMP High, and ITAR. Organizations working with the US government often select Microsoft GCC High to guarantee that their sensitive workloads — from email and collaboration to file storage and security monitoring — remain fully compliant and protected against advanced threats. 

GCC High also integrates closely with Azure Government, enabling hybrid or fully cloud-based deployments that extend secure infrastructure-as-a-service (IaaS) and platform-as-a-service (PaaS) solutions alongside Microsoft 365 productivity tools.  

This dual approach ensures organizations can manage everything from secure messaging in Microsoft Teams to enterprise-grade hosting for custom applications in one compliant ecosystem. 

Commercial Cloud vs GCC vs GCC High

Microsoft provides multiple cloud options to serve different customer segments and compliance requirements. Understanding the differences between them is crucial for organizations determining whether GCC High is necessary. 

Commercial Cloud (Azure Commercial) 

Microsoft’s commercial cloud, including Azure commercial and standard Microsoft 365, is designed for private businesses and general-purpose workloads. While it provides strong security, it does not meet the stringent compliance demands required for Department of Defense contracts or handling ITAR data. This makes it unsuitable for defense contractors and many federal projects. 

Microsoft GCC (Government Community Cloud)

Microsoft GCC offers an elevated security environment for civilian federal agencies and state or local governments. It supports several government compliance frameworks by providing data sovereignty but does not meet the stricter requirements of DFARS 7012 or ITAR.  

GCC High 

Microsoft 365 GCC High is the highest-security cloud offering in Microsoft’s portfolio available to non-federal entities, designed specifically for organizations within the Defense Industrial Base and those working under DoD contracts. It ensures data is stored in restricted data centers, supports impact levels required by DoD contracts, and is the only Microsoft cloud solution that fully satisfies ITAR obligations.  

When delivered through Microsoft 365 GCC High, organizations gain access to the familiar Office 365 productivity suite — including Exchange Online, SharePoint, OneDrive, and Microsoft Teams — all configured to meet the highest levels of compliance. 

Why Do Organizations Choose GCC High? 

Not every organization needs GCC High. However, for companies that work directly with ITAR-controlled data, it’s mandatory. 

Key Benefits

• Unmatched Compliance: Meets DFARS 7012, NIST 800-171, ITAR, and FedRAMP High standards. 
• Data Sovereignty: All data is hosted in U.S.-based data centers with personnel vetted for government security clearances. 
• Comprehensive Collaboration: Provides secure access to Exchange Online, SharePoint, OneDrive, and Microsoft Teams in a compliant environment. 
• Future-Proofing: Designed to align with evolving regulations like CMMC compliance, preparing organizations for upcoming federal cybersecurity mandates. 
• Integrated Cloud Ecosystem: Pairs seamlessly with Azure Government to extend secure workloads beyond collaboration into infrastructure and app hosting. 

For members of the US government supply chain, GCC High ensures operational continuity while satisfying stringent contract clauses and audit requirements. 

Common Use Cases for GCC High

Defense Contractors 

Manufacturers and suppliers in the defense sector rely on GCC High to store engineering data, designs, and communications that are subject to ITAR and DFARS. Without GCC High, they risk noncompliance, contract loss, and potential penalties. 

Federal Agencies  

Civilian agencies with sensitive missions — from energy to intelligence — use GCC High to ensure end-to-end compliance while enabling modern collaboration through Microsoft 365 GCC High features. 

Research and Education Institutions  

Universities and labs conducting federally funded research often handle sensitive defense projects. GCC High ensures their collaboration environments meet CMMC and NIST controls while remaining accessible to cleared researchers. 

Managed Service Providers

MSPs serving defense clients adopt GCC High to provide compliant managed services, from endpoint security to cloud administration, without compromising contractual obligations. 

How To Access the Microsoft GCC High Environment

Unlike commercial Microsoft 365, GCC High is not open for direct purchase or self-service sign-up. Access requires validation and provisioning through authorized resellers who can confirm eligibility and handle the onboarding process. 

Eligibility Requirements  

• Must be a U.S.-based organization or federal agency. 
• Typically limited to defense contractors, state/local governments, and research entities involved in DoD programs or ITAR-controlled work. 

Onboarding Process 

1. Validation: Submit eligibility documentation (e.g., CAGE code, SAM registration).
2. Licensing: Acquire GCC High licenses (such as Office 365 GCC High) through an authorized reseller.
3. Migration: Plan transition from commercial or GCC environments — including account re-provisioning and data migration to maintain compliance. 

Organizations frequently combine GCC High with Azure Government to extend secure workloads beyond collaboration tools into hosting, analytics, and mission-critical applications. 

The Relationship Between CMMC Compliance and GCC High 

The Cybersecurity Maturity Model Certification (CMMC) is rapidly becoming a requirement for organizations within the DoD supply chain. CMMC introduces a tiered certification model to verify that contractors can protect CUI and other sensitive data against evolving cyber threats. 

How GCC High Supports CMMC Compliance 

• CMMC-Aligned Capabilities: GCC High includes the tools and infrastructure needed to support CMMC Level 2 and Level 3 requirements, but achieving compliance depends on selecting the right licenses and properly configuring those tools — this is where CloudFit comes in as a Microsoft government reseller. 
• Audit-Ready Potential: While GCC High offers features like logging, encryption, and access controls that align with CMMC standards, these must be correctly implemented to simplify audits and meet compliance goals. 
• Seamless Data Protection: Features like conditional access, multi-factor authentication, and secure collaboration tools ensure end-to-end protection for CUI and ITAR data. 
• Scalable Compliance: As CMMC evolves, GCC High’s continual updates from Microsoft ensure organizations stay aligned with new mandates without rebuilding infrastructure. 

For contractors aiming to win future DoD contracts, adopting GCC High can serve as a foundational step toward CMMC compliance. 

Migration Challenges and Best Practices

Migrating to GCC High is not as simple as upgrading a commercial Microsoft 365 plan. It requires account re-provisioning, data migration, and reconfiguration of security controls.  

Common challenges include: 

• Eligibility Verification: Proving eligibility can be time-consuming and requires proper documentation, including CAGE codes or SAM registration. 
• Data Transfer Risks: Moving sensitive data, including ITAR or CUI, must be meticulously planned to avoid compliance violations. 
• Identity and Access Management: Reconfiguring accounts for Exchange Online and Microsoft Teams under GCC High requires coordination to maintain user access with new security baselines. 
• Downtime Planning: Migration timelines can disrupt operations if not properly scheduled and phased. 

Best Practices for a Smooth Migration 

• Pre-Migration Readiness Assessment: Evaluate existing compliance posture and identify data subject to ITAR or DFARS controls before migrating. 
• Detailed Data Inventory: Classify information by sensitivity level to prioritize transfer and validate compliance after migration. 
• Phased Deployment Strategy: Migrate in stages, starting with pilot teams, to minimize disruption and troubleshoot issues early. 
• Engage a Trusted Partner: Work with resellers and managed service providers experienced in GCC High migrations and CMMC compliance to streamline onboarding. 
• Post-Migration Security Review: Validate configurations, review permissions, and confirm adherence to DFARS and NIST frameworks post-migration. 

What Are the Cost and Licensing Considerations?

GCC High licensing is distinct from commercial Microsoft 365 pricing. The additional cost reflects its enhanced security, restricted hosting, and compliance certifications. For many organizations, this investment is necessary to win and maintain DoD contracts. 

Office 365 GCC High licenses include core productivity apps (Exchange, SharePoint, Teams, OneDrive) secured to government standards. Pairing these with Azure Government enables organizations to run both collaboration and infrastructure workloads in a fully compliant ecosystem. 

FAQs About GCC High

1. What is the difference between GCC and GCC High? 

GCC serves civilian agencies, while GCC High supports defense and ITAR workloads, offering stricter compliance and segregated hosting. 

2. Can I purchase GCC High directly from Microsoft?  

No. GCC High licenses are only available through authorized resellers who validate eligibility and handle provisioning.  

CloudFit offers GCC and GCC High licenses at highly competitive rates, helping your organization stay compliant with evolving regulatory standards — including CMMC — while optimizing cost and performance. 

3. Does GCC High meet DFARS 7012 and NIST 800-171?

Yes. It is specifically designed to comply with these and other defense regulations. 

4. Can I migrate from commercial Office 365 to GCC High?

Yes, but migration requires re-provisioning accounts and careful planning to maintain compliance. 

5. Who needs GCC High? 

Organizations handling ITAR data, CUI, or working under DoD contracts typically require Microsoft 365 GCC High. 

6. How long does it take to get approved for GCC High? 

Approval timelines vary but typically range from several weeks to a few months, depending on documentation and eligibility review. 

7. Can small businesses use GCC High?

Yes. Many small defense contractors use GCC High, though licensing costs and complexity should be considered in their compliance planning. 

Purchase GCC High Licenses at Competitive Rates Through CloudFit

Unlike commercial Microsoft 365, you cannot purchase GCC High licenses directly from Microsoft. They are only available through authorized Microsoft resellers who validate eligibility and provision the environment on your behalf. 

CloudFit is one such reseller, offering competitive pricing and expert guidance for organizations navigating GCC High adoption. Beyond licensing, CloudFit provides fully managed services to help your team achieve and maintain CMMC compliance, secure GCC High data, and operate a robust cloud environment tailored for defense and federal needs.  

Contact CloudFit to explore licensing options and deployment support. 

Sources: 

Understanding Baselines and Impact Levels in FedRAMP | FedRAMP.gov  

About CMMC | Defense.gov  

Guide to working with DoD | Defense.gov