Microsoft 365 GCC High + DoD Migration Consulting — CMMC 2.0 + ITAR (2026)

Authorization profile: ISO 27001 / 27017 / 27018, SOC 1 / 2 / 3, HIPAA BAA available, GDPR-aligned. Not FedRAMP High. Not authorized for CUI requiring FedRAMP High treatment, ITAR data, or CMMC 2.0 Level 2 in-scope environments without a separate Customer Responsibility analysis.

Authorization profile: FedRAMP Moderate baseline, DoD SRG IL2 aligned. Operated by screened U.S. persons in U.S.-only datacenters. Inherits the FedRAMP Moderate Authority to Operate that Microsoft holds for the GCC offering.

Authorization profile: FedRAMP High baseline, DoD SRG IL4 and IL5 aligned. Operated exclusively by screened U.S. citizens in U.S.-only datacenters. The Microsoft cloud underneath is FedRAMP High authorized — EPC Group, like any consultancy, is FedRAMP-aligned, not itself a FedRAMP cloud service offering. Built to support CMMC 2.0 Level 2 + 3 assessments and ITAR-controlled technical data.

Authorization profile: DoD SRG Impact Level 5 for CUI requiring higher confidentiality or mission-criticality. DoD SRG Impact Level 6 for classified information up to the SECRET level on the SIPRNet boundary. Physically and logically isolated from commercial, GCC, and GCC High. The Microsoft cloud underneath is DoD-authorized — onboarding requires DoD sponsorship and a contract vehicle that names the M365 DoD environment.

Why it matters: DFARS 252.204-7012 (the "Safeguarding Covered Defense Information" clause) requires that any contractor or subcontractor storing, processing, or transmitting Covered Defense Information apply the NIST SP 800-171 controls and report cyber incidents within 72 hours. CMMC 2.0 Level 2 formalizes the same 110 controls into an assessed certification regime. Both regimes drive contractors to a FedRAMP High environment for the CUI processing boundary.

Why it matters: The International Traffic in Arms Regulations (administered by DDTC at the State Department) prohibit non-U.S.-person access to controlled technical data and require storage in U.S.-only environments. ITAR-controlled CAD files, drawings, manuals, and source data cannot live in commercial M365. GCC High is the M365 environment operated exclusively by screened U.S. citizens in U.S.-only datacenters — the operational shape ITAR requires.

Why it matters: The EAR (administered by BIS at Commerce) covers dual-use technology — items with commercial uses that also have potential military or proliferation applications. EAR-controlled technical data also requires U.S.-person handling for many ECCN categories. The Commerce Control List and the Export Compliance Program drive the same boundary requirements as ITAR for the affected technology.

Why it matters: Controlled Unclassified Information is the formal U.S. government category for information that, while not classified, requires protection under federal law, regulation, or government-wide policy. The CUI Registry maintained by the National Archives lists the categories — Critical Infrastructure, Defense, Export Control, Financial, Privacy, and more. NIST SP 800-171 provides the 110 controls that protect CUI in non-federal systems.

Why it matters: Some federal civilian agencies and DoD components explicitly require a FedRAMP High platform for the underlying cloud — even when the workload itself is not CUI-heavy. The standard federal interpretation is that FedRAMP Moderate is insufficient when the data sensitivity warrants the High baseline.

Pattern 1. Commercial → GCC High double-hop migration

Pattern 2. eDiscovery export and CUI data classification at the boundary

Pattern 3. Mailbox migration with cutover and coexistence

Pattern 4. OneDrive and SharePoint content transfer

Pattern 5. Teams + SharePoint reprovision (not migration)

Deliverables: Confirm the destination plane (GCC, GCC High, or DoD) against the contract DFARS / CMMC / ITAR scope. Design the GCC High tenant — naming, domain strategy, Entra ID Government topology, hybrid identity model, Conditional Access baseline, Purview labeling baseline, Defender XDR and Sentinel Government topology. Output: a costed Statement of Work for the migration accelerator, a target-state architecture diagram, and the Authorization Boundary Diagram source for the SSP.

Deliverables: Provision the GCC High tenant, the Entra ID Government tenant, and the Azure Government landing zone. Stand up Microsoft Entra Connect for the hybrid AD source. Configure the Conditional Access baseline (U.S.-only sign-in, MFA, device compliance via Intune for U.S. Government, PIM on privileged roles). Deploy the Purview sensitivity-label baseline for CUI, ITAR, NOFORN, and program tags. Configure Microsoft Defender XDR (Identity, Endpoint, Office 365, Cloud Apps) and Microsoft Sentinel Government workspaces.

Deliverables: Wave 0 pilot of admin and security mailboxes plus a pilot SharePoint site collection. Wave 1 program-CUI mailboxes, OneDrive personal sites, and CUI SharePoint libraries. Wave 2 corporate mailboxes, the bulk of OneDrive content, and corporate SharePoint. Wave 3 Teams reprovision, channel files migration, eDiscovery export of unmigratable chat history, and cleanup. Each wave runs the Pilot Validation gate before promotion.

Deliverables: System Security Plan (SSP) authored against the 110 NIST SP 800-171 controls. Plan of Action and Milestones (POA&M) for the open items. Shared-responsibility matrix (Microsoft cloud vs. EPC implementation vs. customer operations) for every control. Policy and procedure pack — the eight Family Procedures NIST 800-171 requires. Evidence-collection automation for ConMon, plus a pre-assessment dry-run before the C3PAO.

Deliverables: MX cutover at the destination plane. End-user training delivered. The destination Teams federation policy enforced. The Sentinel Government SOC handed off to the customer SOC or to EPC managed services. 30 days of post-go-live hypercare. Runbooks, the Authorization Boundary Diagram, the SSP, the POA&M, and the shared-responsibility matrix are all delivered as customer-owned artifacts ready for the C3PAO assessment.

When do I need GCC High vs. Commercial M365 with data sovereignty add-ons?

GCC High is the right destination when you have CUI named on the contract, DFARS 252.204-7012 flow-down, a CMMC 2.0 Level 2 or 3 assessment requirement, ITAR-controlled technical data, or an explicit FedRAMP High requirement in the solicitation. Commercial M365 with EU Data Boundary or Customer Key may give sovereignty over data residency and key custody for commercial contractors, but it does not change the underlying cloud authorization — the Microsoft cloud underneath commercial M365 is not FedRAMP High, and the operations personnel are not screened U.S. citizens. Sovereignty add-ons are a sovereignty story, not a CMMC story. If your contract names CUI, ITAR, or CMMC 2.0 Level 2, the defensible target is GCC High.

What is the difference between ITAR data and CUI?

CUI (Controlled Unclassified Information) is the U.S. government umbrella category for unclassified information requiring protection under federal law, regulation, or government-wide policy. The CUI Registry at the National Archives lists the categories — Critical Infrastructure, Defense, Export Control, Privacy, Financial, and more. ITAR-controlled technical data is one specific subset of CUI under the Defense and Export Control categories — covering items on the U.S. Munitions List administered by the State Department. All ITAR data is CUI (or close to it for handling purposes), but not all CUI is ITAR. Practically: ITAR drives the U.S.-persons-only access requirement very hard, and CMMC 2.0 Level 2 drives the 110 NIST SP 800-171 controls. Both end up on GCC High for the M365 surface.

How much does GCC High cost compared to commercial M365?

GCC High license costs are higher than commercial M365 for the equivalent license tier. The specific delta varies by license SKU and tenant size, but a useful planning rule is that GCC High licensing typically runs notably higher per seat than the commercial equivalent — the exact multiplier depends on the M365 SKU, the Microsoft contract vehicle, and any government-pricing arrangements. Add the migration accelerator (typically $300K–$1.2M depending on seat count and CMMC scope), the ongoing CMMC 2.0 evidence-collection overhead, and any third-party migration tooling. Verify current GCC High pricing on the Microsoft government price list and through your Microsoft licensing partner before locking the business case — published list prices change, and authoritative pricing always comes from Microsoft. EPC delivers the migration on a fixed-fee basis so the consulting cost is predictable; the Microsoft licensing is separate and scopes per your seat count.

Can my contractor users still collaborate with commercial M365 colleagues from GCC High?

Yes, with constraints. Microsoft Entra B2B supports cross-cloud guest collaboration between commercial Entra ID and Entra ID Government — under tenant cross-cloud settings on both sides. Teams federation between GCC High and commercial M365 is more constrained: shared channels work in some configurations, guest access from commercial tenants is supported with policy, and external file-sharing through SharePoint is configurable. The federation pattern needs to be designed before cutover — most user complaints after a GCC High migration trace back to a federation pattern that was not communicated in advance. EPC documents the destination collaboration pattern in the tenant administrator runbook and trains the user community on the new external-collaboration model.

Does CMMC 2.0 Level 2 require GCC High specifically, or just a FedRAMP High environment?

CMMC 2.0 does not literally name "GCC High" as the required environment — it requires the contractor demonstrate compliance with the 110 NIST SP 800-171 controls against CUI. The defensible interpretation for the M365 surface is that CMMC 2.0 Level 2 CUI must reside in an environment with FedRAMP Moderate-equivalent or higher protection plus the additional contractor-implemented controls. The Microsoft cloud underneath GCC High is FedRAMP High authorized and operated by screened U.S. citizens in U.S.-only datacenters — which is why GCC High is the standard contractor target. For Azure infrastructure workloads, Azure Government is the equivalent destination. EPC produces the System Security Plan and shared-responsibility matrix that demonstrates the environment satisfies the 110 controls for a C3PAO assessment.

Is M365 Copilot available on GCC High?

Microsoft has been progressively expanding Microsoft 365 Copilot availability across the government planes, but availability and feature parity on GCC High and DoD lag the commercial release cadence. Some Copilot capabilities are available on GCC and GCC High; some are gated, in preview, or not yet available. Verify the current GCC High Copilot road map at the time of your project against the Microsoft Government cloud documentation — and budget Copilot enablement as a Phase 2 deliverable on a GCC High migration, not a Phase 1 promise. The right pattern is: migrate to GCC High first under the CMMC posture, then enable Copilot on the schedule Microsoft supports on the destination plane.

What is the EPC GCC High Migration Accelerator price range?

The EPC GCC High Migration Accelerator typically lands between $300K and $1.2M for a 200-to-5,000-seat federal contractor migration, depending on the destination scope, the CMMC 2.0 readiness depth, the number of source tenants being consolidated, the SharePoint and OneDrive content volume, and whether Sentinel Government managed SOC services follow the migration. A 200-500 seat single-tenant commercial-to-GCC-High migration with FedRAMP-aligned baseline and a Level 2 SSP typically lands in the $300K–$600K range. A 1,000-5,000 seat M&A multi-tenant consolidation into a single GCC High tenant with full CMMC 2.0 Level 2 readiness and a Sentinel Government SOC handoff typically lands in the $750K–$1.2M range. EPC delivers on a fixed-fee, milestone-priced basis after the 3-week Federal Microsoft Readiness Assessment — no time-and-materials surprises after the SOW signs.

Is EPC Group a FedRAMP-aligned partner or does the firm itself hold a FedRAMP authorization?

FedRAMP authorization is granted to cloud service offerings (CSOs) — not to consulting firms. Microsoft 365 GCC High and Azure Government are the cloud services that hold the FedRAMP High authorization. EPC Group is FedRAMP-aligned: the firm delivers Microsoft cloud implementations mapped to the FedRAMP control catalog and produces the documentation (Authorization Boundary Diagram, Control Implementation Summary workbook, Continuous Monitoring plan, shared-responsibility matrix) that an agency Information System Security Officer or a contractor CISO submits to the Authorizing Official for an Authority to Operate. No consultancy is literally "FedRAMP framework contributor" — the term is reserved for the underlying cloud service. EPC is a Microsoft Solutions Partner with nearly three decades of Microsoft delivery and named federal past performance including NASA, the FBI, the FRBNY (Federal Reserve Bank of New York), and the Pentagon.