Use this when the question is not “which vendor is best?” but “where should CUI actually live and who operates it after rollout?” GCC High, enclaves, and MSPs can overlap, but they carry different operating burdens.
Call the GCC High lane when collaboration is the boundary
GCC High may fit when email, Teams, SharePoint, identity, and file collaboration are part of normal CUI flow. Watch the migration disruption, licensing, administration capacity, and evidence ownership after cutover.
Use an enclave when containment beats migration
An enclave can work when a defined user group needs a controlled CUI workspace and the rest of the company can stay out of scope. Pressure-test endpoints, integrations, file exports, printing, and support boundaries.
Choose an MSP when daily operations are the gap
This lane fits when the contractor cannot reliably operate endpoints, identity, logs, patching, backup, ticketing, and evidence-producing security processes on its own.
Watch for bundled labels hiding the responsibility matrix
Some providers sell migration, enclave, and managed service work together. Ask who owns each control, which evidence is inherited, and which tasks stay with your team.
Sequence the decision around CUI flow
If CUI is limited to a few workflows, enclave-first may reduce cleanup. If CUI is spread through email, engineering, project work, and customer collaboration, broader migration or managed operations may hold up better.
Ask who operates month two
Before signing, name the owner for users, logs, incidents, configuration changes, onboarding, offboarding, and recurring evidence. CMMC gets expensive when nobody owns the operating model after implementation.
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