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Decision guide · Productivity suite

Microsoft 365 or Google Workspace: a structured 2026 decision

Choosing between Microsoft 365 and Google Workspace is no longer an office decision. It is a platform decision for identity, compliance tooling, endpoint security, AI integration and data residency with a 7-10 year horizon.

TL;DR

M365 wins in regulated and enterprise. Workspace wins in engineering cultures and mid-market. Hybrid is the most expensive variant.

Who owns this decision

CIO is owner. CISO, Data Protection, Endpoint Engineering, Finance in the steering group.

Key criteria to weight

  • Identity and IAM depth

    Entra ID vs Google Cloud Identity.

  • Compliance tooling

    Microsoft Purview vs Google Vault.

  • Endpoint and security

    Defender for Endpoint vs Google Endpoint plus ChromeOS.

  • AI integration

    Copilot for M365 vs Gemini for Workspace.

  • EU data residency and sovereign cloud options

    Microsoft Cloud for Sovereignty, Google Sovereign Cloud.

  • TCO including tiers

    Hidden costs in Power Platform, Defender, Purview.

Step-by-step decision flow

  1. 1

    Strategic anchor

    Which platform fits the identity, compliance and endpoint strategy of the next 7 years?

  2. 2

    Workload mapping

    Email, collaboration, identity, endpoint, compliance, AI, storage, telephony.

  3. 3

    Vendor deep dive

    Sovereign options, BSI C5 status, AI data protection clauses, exit strategy.

  4. 4

    TCO 5 years

    Licences, migration, training, stack consolidation lever.

  5. 5

    Memo and board approval

    Decision memo plus 18-month migration plan if a switch is needed.

Compliance note

GDPR Art. 28 plus EU AI Act for AI components. NIS2 Art. 21. BAIT/VAIT and DORA Art. 28-30 for banks/insurers. BSI C5 Type 2 is a de facto minimum.

Common pitfalls

  • !AI components enabled without data protection review. Data outflow into US backbones.
  • !Licence tier too small. Defender, Purview, Compliance suite missing.
  • !Hybrid platforms tolerated. TCO and compliance killer.
  • !Exit strategy missing. DORA compliance risk for financial entities.

FAQ

Is Microsoft 365 GDPR-compliant in the EU?

With the EU Data Boundary for M365 service data stays in the EU. Conservative GDPR practice adds BYOK and possibly Microsoft Cloud for Sovereignty.

Is Copilot for M365 production-ready?

Yes, but the internal permission model must be cleaned first.

How heavy is a switch between the two platforms?

Realistically 12-24 months. Real complexity sits in identity, endpoint management, application adaptation and training.

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