Microsoft 365 Copilot vs Google Workspace AI: Compliance Comparison for Small Teams

Small teams choosing between Microsoft 365 Copilot and Google Workspace AI are usually comparing features and price. The compliance differences are less visible but more consequential, especially for teams subject to GDPR, HIPAA, or sector-specific data regulations.

This comparison focuses on the factors that matter for compliance: DPA terms, model providers, data residency, training policy, admin controls, and audit logging. Feature parity questions (which writes better emails) are covered elsewhere.

Updated September 30, 2026. We rechecked this page against Microsoft's and Google's own documentation. Five claims from the earlier version changed: Copilot no longer runs only on OpenAI models, the Anthropic exception to the EU Data Boundary, Copilot pricing and licensing, Google's pricing, and Google's audit logging. Details are below.

TL;DR: Neither product trains on your organization's data, and both offer a DPA and a HIPAA path. The 2026 differences are model providers (Copilot now offers OpenAI and Anthropic models as Microsoft subprocessors, with Anthropic outside the EU Data Boundary, while Google runs Gemini), audit tooling (Purview retention and content search versus Gemini log events and Vault), and price (Copilot Business is $21 per user on top of a Microsoft 365 plan, while Gemini is included in Google Workspace Standard at $14).

The One-Line Version

Both products offer non-training data policies and GDPR-oriented DPAs for paid plans. The meaningful differences are in model providers, permission scope, audit tooling, and residency specificity. Microsoft has more retention and search controls for AI interactions. Google has simpler pricing and a single model provider.

Data Processing and Training

What this means in practice: neither product uses your organization's documents, emails, or prompts to train the underlying models. For both, this commitment applies to paid commercial plans, not to consumer versions.

The important 2026 change is on the Microsoft side. Copilot used to be described as running only on Azure OpenAI Service. Microsoft's current documentation says it offers third-party models in Copilot, including Anthropic and OpenAI models, with Anthropic and OpenAI acting as subprocessors, plus Microsoft-hosted models. Admins decide whether to use the third-party models, and additional terms can apply. Our Notion AI vs Microsoft Copilot comparison covers the subprocessor settings in detail.

Google Workspace AI runs Google's Gemini models, so the model provider is Google itself. Still check Google's subprocessor list, since it applies to the wider Workspace service.

EU Data Residency

Microsoft. Copilot is an EU Data Boundary service. Microsoft states that for EU users, traffic stays within the EU Data Boundary, while worldwide traffic can be sent to the EU and other regions for model processing. Two caveats matter for compliance teams:

• Models provided by Anthropic as a Microsoft subprocessor are currently excluded from the EU Data Boundary.
• For tenants in the EU, EFTA, and the UK, Anthropic models are off by default. Microsoft added an admin setting on April 3, 2026 that lets those tenants make Anthropic the default model for Copilot in Microsoft 365 apps. Turning it on is a residency decision to record in your DPIA.

Copilot was added as a covered workload in Microsoft's data residency commitments on March 1, 2024.

Google. Google Workspace lets admins set data regions for covered data. The generative AI privacy hub page we checked does not state where generative AI processing happens by region, so confirm with Google how your region setting applies to each Gemini feature before you claim EU-only processing. Google's April 2026 announcement of Workspace Intelligence describes admin controls and sovereign data controls for the US and EU, with more countries planned.

Verdict on residency: Microsoft is more explicit and has a documented exception you can act on (disable Anthropic, or leave it off in the EU). Google requires a per-feature check.

The Oversharing Problem, Microsoft Copilot

The compliance risk most often missed with Copilot is not a data leak from Microsoft. It is a data leak from your own SharePoint and OneDrive permissions.

Microsoft states that Copilot only surfaces organizational data to which individual users have at least view permissions. If your organization has legacy SharePoint permissions that were never cleaned up, departmental files shared broadly "just in case", or sensitive documents accessible to all staff, Copilot will retrieve those files in response to employee queries. An HR document visible to all managers will be retrievable by any manager who asks Copilot about compensation. The AI does not enforce intent. It enforces permissions.

Before deploying Copilot, run a permissions review. Microsoft Purview and SharePoint admin tooling can help report on oversharing, and which features you get depends on your license, so check Microsoft's licensing guidance for your plan. For small teams on Business plans, plan for a manual review of your most sensitive sites.

Google Workspace Intelligence has the same shape of risk. It grounds Gemini in your Gmail, Chat, Calendar, and Drive data, and it respects each user's existing access. Broad Drive sharing produces broad AI answers. Audit sharing settings before you enable it organization-wide.

Audit Logging

Microsoft Copilot. Copilot interactions generate audit records automatically when Copilot is licensed and in use, as part of Microsoft Purview Audit (Standard), with no extra configuration if auditing is on. Details that matter:

• Default audit log retention is 180 days for Audit (Standard).
• Retention up to one year requires an Office 365 E5, Microsoft 365 E5, or Purview Suite or E5 eDiscovery and Audit add-on license for the user who generated the log.
• The prompt and response, which Microsoft calls the "content of interactions", are stored and encrypted. Admins can search them with Content search or Purview, and can set retention policies for Copilot chat interactions.
• Users can delete their own Copilot activity history from the My Account portal.

Google Workspace AI. Gemini activity has its own log events:

• Admin console Reporting has "Gemini for Workspace log events" under Audit and investigation, and the same data is available through the Reporting API and the security and audit investigation tools.
• Logs can be exported and reviewed in BigQuery.
• Vault can search and export prompts and responses from the Gemini app for eDiscovery.
• Google says admins cannot delete log event data or change how long it is available.
• Admins can set Gemini app conversations to delete automatically after 3, 18, or 36 months. With conversation history off, new chats are saved for up to 72 hours.

Verdict on auditing: both now provide real audit trails. Microsoft gives you more control over retention length and content search through Purview, which matters if you must show a regulator what the AI accessed and when. Google gives you native Gemini log events plus Vault, with fixed log retention. The earlier version of this page said Google offered only feature usage counts. That is no longer accurate.

DPA Access and Setup

Microsoft DPA. Covered by the Microsoft Product Terms and the Microsoft Data Protection Addendum, which apply to Copilot as a commercial service. Microsoft states that Copilot complies with its GDPR and EU Data Boundary commitments. One exception to note: "Anthropic models with Data Retention" (advanced models that require retention by Anthropic) are outside your Microsoft agreement and need explicit admin opt-in under Anthropic's own commercial terms and data processing addendum. They are off by default.

Google Workspace DPA. Google's data processing terms are accepted by the customer through the Admin console for paid Workspace accounts. Check the current terms page linked in the references before you rely on a specific menu path, since Google reorganizes the console.

Both are standard terms for SMB plans.

HIPAA

Both vendors document a HIPAA path, with exceptions you must check:

• Microsoft Copilot: Microsoft lists HIPAA among Copilot's compliance offerings. Verify with your Microsoft licensing contact that the Copilot features you plan to use are in your BAA scope.
• Google Workspace: Google says Gemini can support HIPAA workloads and has updated its HIPAA Included Functionality to reflect Gemini. Two exceptions are stated: Gemini Notebook and Gemini in Chrome do not support HIPAA compliance.

Do not assume every AI feature is BAA-covered. AI features are sometimes added to products before coverage is updated, and both vendors already list exclusions.

Pricing Context

Microsoft Copilot:

• Copilot Business lists at $21 per user per month with an annual commitment ($25.20 monthly billing), for organizations up to 300 users, and requires a qualifying Microsoft 365 plan. Microsoft lists a promotional $18 price for the first year on offers between July 1 and December 31, 2026.
• Bundles: Microsoft 365 Business Standard with Copilot at $23.50 per user per month, and Business Premium with Copilot at $32.00, both on annual billing.
• For larger organizations, the enterprise version of Copilot is priced higher. Third-party guides list $30 per user per month, but that figure was not on the pricing page we checked, so confirm with Microsoft.
• A 10-person team on Copilot Business pays about $210 per month for the add-on, before the base Microsoft 365 plan.

Google Workspace with Gemini:

• Business Starter $7, Business Standard $14, Business Plus $22 per user per month on annual billing. Enterprise is custom quoted.
• Gemini AI features are part of the plans. Starter has Gemini in Gmail and the Gemini app, while Gemini in Docs, Sheets, Slides, Drive, and Meet is not available on Starter only.
• A 10-person team on Standard pays about $140 per month, AI included.

The cost difference remains significant for small teams, but it is smaller than the earlier $30 versus included framing suggested.

Which to Choose

Choose Microsoft Copilot if:

• Your team already runs on Microsoft 365 (Teams, SharePoint, Outlook) and switching costs are high
• You need retention control and content search over AI interactions for regulatory purposes
• You want admin control over which model providers are active, by user and group
• You have time to run a permissions review before rollout

Choose Google Workspace AI if:

• You are on Google Workspace and have no Microsoft migration to justify
• You want AI features without a separate add-on cost
• You prefer Google as the single model provider in your record of processing
• You want simpler setup with less admin overhead

Both are viable for GDPR compliance. The differentiators are operational: how much retention and search control you need, whether a multi-provider model path is acceptable, and how clean your existing permissions are.

How Each Platform Handles Employee Monitoring via AI

A compliance question that comes up in employment law contexts: can Copilot or Workspace AI be used to monitor employee activity, and what are the disclosure obligations?

Copilot. Meeting summaries and similar features can surface participation and engagement signals. Using them to evaluate individual performance creates obligations under employment law and, in the EU, under GDPR's rules on automated decision-making. Microsoft states that it restricts the use of generative AI from making inferences, judgments, or evaluations about an employee's performance, attitude, internal or emotional state, or personal characteristics.

Google Workspace AI has similar exposure through Meet transcription, Gemini summaries, and Drive activity. The compliance risk is the same.

On the EU AI Act, Annex III covers AI systems used in employment contexts as high-risk. The Digital Omnibus moved the Annex III high-risk deadline from August 2, 2026 to December 2, 2027, as Regulation (EU) 2026/1744, in force since July 27, 2026. Our Digital Omnibus tracker has the full timeline. Until then, deployer duties under Article 26 are not yet in force, but GDPR and national employment law already apply. Practical guidance for both platforms: do not use AI-generated meeting summaries, participation metrics, or productivity signals in employment decisions without disclosure to employees and a human reviewer making the final call.

Before You Deploy Either

1. Review the DPA and confirm the data processing terms match your obligations (GDPR, HIPAA, state privacy laws)
2. Record the AI providers that are enabled. For Copilot, check the "AI providers operating as Microsoft subprocessors" setting. For Google, note that Gemini is the model provider
3. Audit existing permissions. For Microsoft, check SharePoint and OneDrive. For Google, check Drive sharing settings
4. Update your AI acceptable use policy to specify which features are approved for which data categories
5. Train your team on what not to input (PII, attorney-client communications, undisclosed financial data)

Use the AI Vendor Scorecard to compare Microsoft and Google against your specific compliance requirements, or run the Compliance Quiz to see which regulations apply to your team before locking in a vendor choice.

2026 Updates: What Changed at Each Platform

Google Workspace Intelligence (April 2026). Google announced Workspace Intelligence, a layer that grounds Gemini in Gmail, Chat, Calendar, and Drive data. Google's announcement says admins can enable or disable specific data sources (Gmail, Drive, Calendar, Chat) at the domain, organizational unit, or group level, and that content is not human reviewed or used for model training outside your domain without permission. Rollout began April 22, 2026.

Google AI control center (May 2026). A new admin module to manage AI and agent access to Workspace data, published on Google's Workspace Updates blog.

Google Gemini Notebook audit logs (August 2026). Google announced comprehensive audit logs for Gemini Notebook in the Admin console. Note that Gemini Notebook is excluded from HIPAA support.

Microsoft Anthropic subprocessor changes (2026). Anthropic became a Microsoft subprocessor for Copilot, on by default for most commercial customers outside the EU, EFTA, and UK. An April 3, 2026 setting lets EU, EFTA, and UK tenants use Anthropic as the default model for Copilot in Microsoft 365 apps. Since July 22, 2026, non-federal GCC customers can enable Anthropic models. Microsoft's Anthropic documentation was last updated September 18, 2026.

Agents and Copilot Studio. When Copilot uses agents, Microsoft tells admins to check each agent's privacy statement and terms of use to see how it handles your data, and admins control which agents are allowed. Do not assume a custom or third-party agent inherits the base Copilot terms.

References

1. Microsoft Learn, Data, Privacy, and Security for Microsoft Copilot: https://learn.microsoft.com/en-us/copilot/microsoft-365/microsoft-365-copilot-privacy
2. Microsoft Learn, Anthropic models in Microsoft Online Services: https://learn.microsoft.com/en-us/copilot/microsoft-365/connect-to-ai-subprocessor
3. Microsoft Copilot plans and pricing: https://www.microsoft.com/en-us/microsoft-365-copilot/pricing
4. Microsoft Purview, Audit logs for Copilot and AI applications: https://learn.microsoft.com/en-us/purview/audit-copilot
5. Microsoft Product Terms, Data Protection Addendum: https://www.microsoft.com/licensing/docs/view/Microsoft-Products-and-Services-Data-Protection-Addendum-DPA
6. Google Workspace, Generative AI in Google Workspace Privacy Hub: https://knowledge.workspace.google.com/admin/generative-ai/generative-ai-in-google-workspace-privacy-hub
7. Google Workspace pricing: https://workspace.google.com/pricing
8. Google Workspace Updates, Introducing Workspace Intelligence, with admin controls: https://workspaceupdates.googleblog.com/2026/04/introducing-workspace-intelligence-with-admin-controls.html
9. Google Workspace Updates, AI control center: https://workspaceupdates.googleblog.com/2026/05/securely-manage-AI-and-agent-access-to-Workspace-data-with-the-AI-control-center.html
10. Google Workspace Help, Gemini for Workspace log events: https://knowledge.workspace.google.com/admin/reports/gemini-for-workspace-log-events

Which Should Small Teams Choose?

If your team is already in the Microsoft 365 ecosystem and needs retention control and content search over AI interactions, Copilot is the path of least resistance, provided you decide deliberately on the Anthropic setting. If your team uses Google Workspace and wants one model provider with AI included in the plan price, Gemini in Workspace offers comparable assistance with strong DPA terms and no additional procurement layer. For teams that are genuinely undecided, the audit and retention controls and the model-provider path should decide it, not the feature set.

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