Partial CUI Compliance
2 NIST 800-171 gaps detected. FedRAMP In Process, not certified. The marketplace record for Microsoft 365 Government Community Cloud & Supporting Services (MSO365MT) shows status FedRAMP In Process, phase Initial Implementation, read 2026-07-27 — 98 agency ATOs are recorded against it, but the offering is not certified. GCC is also not GCC High: Microsoft 365 GCC-High (FR1824057433) is the separate High-class record. Do not assume GCC covers DoD CUI, and do not assume it covers ITAR or export-controlled data at all.
Microsoft 365 GCC
by Microsoft
FedRAMP Status
FedRAMP In Process
Impact Level
N/A
Category
Overview
Microsoft 365 GCC is not FedRAMP certified. The FedRAMP Marketplace record for Microsoft 365 Government Community Cloud & Supporting Services (Microsoft) shows status FedRAMP In Process with no certification date, read 2026-07-27 (https://www.fedramp.gov/marketplace/products/MSO365MT/). In process is not an authorization, and an agency ATO recorded against an in-process package is that agency's decision, not a FedRAMP certification.
CUI Risk Assessment
FedRAMP In Process, not certified. The marketplace record for Microsoft 365 Government Community Cloud & Supporting Services (MSO365MT) shows status FedRAMP In Process, phase Initial Implementation, read 2026-07-27 — 98 agency ATOs are recorded against it, but the offering is not certified. GCC is also not GCC High: Microsoft 365 GCC-High (FR1824057433) is the separate High-class record. Do not assume GCC covers DoD CUI, and do not assume it covers ITAR or export-controlled data at all.
Deployment & Architecture
Deployment Model: Government Cloud (FedRAMP boundary)
Microsoft 365 GCC is pursuing FedRAMP authorization. Until authorized, this tool should not be used for CUI processing in production. Defense contractors should plan migration timelines and identify compensating controls.
Migration Checklist
- 1ISSO: Conduct data classification audit using Microsoft Purview within 14 days to identify CUI in current GCC tenant
- 2Contracts: Review all active DoD contracts to confirm CUI handling requirements and GCC High mandate within 7 days
- 3Sysadmin: Configure network segmentation to isolate GCC from CUI networks immediately, updating firewall rules
- 4ISSO: Update authorization boundary diagrams removing GCC from CUI data flows within 21 days
- 5Sysadmin: Implement DLP policies preventing CUI uploads to GCC environment within 14 days
- 6ISSO: Initiate GCC High tenant provisioning through Microsoft Premier Support (45-60 day lead time)
- 7Sysadmin: Execute tenant-to-tenant mailbox migration using Microsoft migration tools over 2-week window
- 8ISSO: Submit updated SSP and POAM to DCMA reflecting GCC High implementation within 30 days post-migration
NIST 800-171 Violations
Using Microsoft 365 GCC for CUI without FedRAMP authorization may violate these NIST 800-171 controls:
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FedRAMP Compliant Alternatives
Related Compliance Assessments
Frequently Asked Questions
Is Microsoft 365 GCC sufficient for CUI?
The FedRAMP Marketplace record for Microsoft 365 Government Community Cloud & Supporting Services (Microsoft) shows status FedRAMP In Process with no certification date, read 2026-07-27 (https://www.fedramp.gov/marketplace/products/MSO365MT/). In process is not an authorization, and an agency ATO recorded against an in-process package is that agency's decision, not a FedRAMP certification.
Why do so many contractors get this wrong?
The naming is confusing. "GCC" sounds government-compliant, and Microsoft markets it for government use. But the critical difference is GCC = Moderate, GCC High = High. Most DoD CUI contracts require High.
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