FedRAMP Collaboration Tools Decision Matrix 2026

A side-by-side comparison of Microsoft 365 GCC High, Google Workspace for Government, Mattermost for Government, and Slack GovSlack across FedRAMP authorization level, sponsoring agency, and CMMC 2.0 readiness.

Cabrillo Club

Cabrillo Club

Editorial Team · September 5, 2026 · 3 min read

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FedRAMP Collaboration Tools Decision Matrix 2026

  • This matrix compares Microsoft 365 GCC High, Google Workspace for Government, Mattermost for Government, and Slack GovSlack across authorization level, CUI handling, pricing tier, and DoD use cases.
  • Microsoft 365 GCC High carries a FedRAMP High authorization with a DoD sponsoring agency and an authorization date of 2018-06-20 (FedRAMP listing). A FedRAMP High authorization exceeds the FedRAMP Moderate baseline that DFARS 252.204-7012 requires of a cloud service holding covered defense information; export-controlled data (ITAR) and DoD impact levels (IL4/IL5) are separate determinations to confirm for your contract.
  • Microsoft 365 GCC High is listed with an enterprise pricing tier in the FedRAMP product catalog (FedRAMP listing).
  • Our CMMC 2.0 readiness check rates Microsoft 365 GCC High 'CMMC Ready, target Level 3' with 96% coverage of the NIST SP 800-171 controls and 2 gaps (3.1.20, 3.3.1). CMMC 2.0 certifies your environment, not a product; treat a product rating as an input to your SSP.
  • Our enterprise-tools check records Microsoft 365 GCC High (Exchange Online) as FedRAMP High authorized with a 2024-12-26 authorization date and a green compliance color for CUI risk. The catalog carries both dates; verify the current authorization boundary on fedramp.gov/marketplace before you cite it in your SSP.
  • Microsoft Teams GCC High is separately cataloged as a FedRAMP High authorized collaboration platform with a 2019-04-15 authorization date and DoD sponsorship (FedRAMP listing). Teams GCC High inherits the same High impact boundary as the broader GCC High suite for chat, meetings, and file sharing.
  • Microsoft Teams GCC High carries an enterprise pricing tier and a compliance score of 89 in the product catalog (FedRAMP listing).
  • Google Workspace for Government is cataloged as FedRAMP Moderate authorized with a GSA sponsoring agency and a 2021-03-25 authorization date (FedRAMP listing). FedRAMP Moderate is the baseline DFARS 252.204-7012 requires of a cloud service holding covered defense information, so Moderate-authorized tools can hold CUI; confirm whether your contract adds a DoD impact-level (IL4/IL5) requirement.
  • Google Workspace for Government carries an enterprise pricing tier and a compliance score of 87 (FedRAMP listing). Your NIST SP 800-171 responsibilities for CUI inside Workspace stay yours: document them in your SSP. DFARS 252.204-7012 does not require a High-authorized file store.
  • Our productivity-tools check also lists Google Workspace (Government) as FedRAMP Moderate, authorized 2021-03-25, with an enterprise tier and compliance score 88.
  • Our AI CUI check flags Gemini in Google Workspace (commercial) as capped at DoD IL2 with IL4 and IL5 columns blank, and a red compliance color (AI CUI check). Keep CUI out of Gemini in commercial Workspace (AI CUI check) unless your tenant's Gemini carries a FedRAMP Moderate-or-higher authorization you can cite.
  • Mattermost for Government is listed as FedRAMP Moderate in-process with a mid-market pricing tier and a compliance score of 78. In-process means no authorization to operate yet; under DFARS 252.204-7012 you would need a FedRAMP Moderate equivalency assessment to hold CUI in it today.
  • Our enterprise-tools check records Mattermost (self-hosted) as not authorized, impact level none, red compliance color, and no certified FedRAMP Marketplace record as of 2026-07-27. A self-hosted Mattermost runs inside your own boundary, so FedRAMP does not apply to it; the NIST SP 800-171 controls in your SSP do.
  • Slack GovSlack is cataloged as FedRAMP Moderate authorized with a GSA sponsoring agency and a 2022-08-10 authorization date (FedRAMP listing). FedRAMP Moderate meets the DFARS 252.204-7012 baseline for CUI; confirm any DoD impact-level requirement in your contract.
  • Slack GovSlack carries an enterprise pricing tier and a compliance score of 87 (FedRAMP listing). Verify whether your contract requires a DoD impact level (IL4/IL5) before committing to GovSlack.
  • Microsoft 365 Copilot in GCC High/DoD is marked green with a verdict label of authorized environment for CUI holders. Confirm with Microsoft that Copilot is enabled inside your GCC High tenant's authorization boundary before CUI touches it.
  • Next steps: confirm each tool's current authorization status on fedramp.gov/marketplace, map your contract's required impact level to the tool's authorization, and document any compensating controls for Moderate-authorized tools handling CUI.

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Cabrillo Club

Cabrillo Club

Editorial Team

Cabrillo Club is a defense technology company building AI-powered tools for government contractors. Our editorial team combines deep expertise in CMMC compliance, federal acquisition, and secure AI infrastructure to produce actionable guidance for the defense industrial base.

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