Microsoft 365 Copilot: AI in the Microsoft Ecosystem
If you spend all day in Outlook, Teams, and Word, the most convenient place to get AI is right where you already are. That is exactly the promise of Microsoft 365 Copilot: no additional tool, but AI as a feature in the programs your company already runs.
The flip side: Copilot ties you even deeper to Microsoft and only knows the models Microsoft provides. For decision-makers, a sober look at features, costs, and the privacy details is worth it.
What Microsoft 365 Copilot Is
Copilot is the umbrella term for Microsoft's AI assistants. What matters for businesses is Microsoft 365 Copilot: AI in Word, Excel, PowerPoint, Outlook, and Teams, with access to emails, documents, and chats in your own tenant. Copilot summarizes meetings, drafts documents, analyzes spreadsheets, and answers questions across your company data.
Add Copilot Studio for custom agents and, since 2026, features like Work IQ, which factors in work context and preferences. Under the hood run OpenAI models; since early 2026, Microsoft supplements them with Claude models from Anthropic for selected features.
Important distinction: the free Copilot and Copilot Pro are consumer products without enterprise data protection. For company use, only the business license counts.
What Copilot Costs
Microsoft 365 Copilot costs about 28 EUR per user per month on top of the existing Microsoft 365 license (as of July 2026). A qualifying base license is required, typically Business Standard, Business Premium, E3, or E5.
With 100 employees, that is roughly 34,000 EUR per year on top of the existing Microsoft costs. Agents and consumption-based features are billed additionally via Copilot Credits. At the same time, Microsoft is gradually folding Copilot into its bundle prices, so the pricing structure is in flux.
For comparison: multi-model platforms like Langdock run at around 20 EUR per user per month, without a Microsoft license requirement, but also without the deep Office integration.
Data Privacy: Solved, But with Pitfalls
The fundamentals are in place: company data stays in the tenant, is not used to train public models, and the EU Data Boundary contractually guarantees processing in Europe. The Hessian data protection authority confirmed fundamental GDPR compliance in a detailed report in late 2025.
Two points still demand attention:
Flex routing: Since April 2026, Microsoft may process AI requests in data centers outside the EU during load peaks. For new tenants, this is on by default. If you want to strictly stay within the EU Data Boundary, you must disable the option in the admin center and update your data protection impact assessment.
Permissions: Copilot sees everything the user is allowed to see. Overly broad shares in SharePoint and Teams thus become an AI problem: the assistant finds the salary document that never should have been shared. Clean up the permission model before the rollout.
We summarized the general criteria for legally sound AI use in our article on GDPR-compliant AI use.
Who Copilot Pays Off For
Copilot fits when the company is deep in the Microsoft ecosystem and AI is mainly meant to speed up office work: meeting summaries, email drafts, document analysis. The integration into the workflow is unmatched, as long as that workflow consists of Microsoft tools.
Alternatives fit better when model diversity matters (Copilot only knows Microsoft's model selection, platforms like Langdock over 40 models), when Microsoft dependency is a strategic concern anyway, or when AI should go into your own product. For AI features in your own website or customer platform, there is no way around a direct AI integration via model APIs; Copilot is not built for that.
Here too: both can run in parallel. Copilot for internal office work, a model-agnostic integration for your own platform.
Use AI beyond the Office suite?
arocom advises vendor-independently on AI platforms and integrates AI features directly into Drupal. Write to us for a no-obligation conversation.
Which platform, which model, which legal framework: questions we regularly work through on client engagements. For strategic sparring at executive level there is arocon, the consulting brand from the arocom family.
What does Microsoft 365 Copilot cost?
About 28 EUR per user per month on top of the existing Microsoft 365 license (as of July 2026). A qualifying base license such as Business Standard, Business Premium, E3, or E5 is required. Agents and consumption-based features cost extra.
Is Microsoft 365 Copilot GDPR-compliant?
Fundamentally yes. Company data stays in the tenant, is not used for model training, and the EU Data Boundary guarantees EU processing. Watch out for flex routing (on by default since April 2026), which can process requests outside the EU during load peaks, and for the permission model before rollout.
What is the difference between Copilot and Copilot Pro?
The free Copilot and Copilot Pro are consumer products without a DPA and without enterprise data protection. For company use, only Microsoft 365 Copilot with a business license is suitable, which keeps data in your own tenant.
Which AI models does Copilot use?
Primarily OpenAI models, and since early 2026 also Claude models from Anthropic for selected features, each chosen by Microsoft. There is no free model choice as with multi-model platforms.
What is flex routing and why does it matter?
Since April 2026, Microsoft may process AI requests in data centers outside the EU under high load, on by default for new tenants. If you need strict EU processing, disable the option in the admin center and update your data protection impact assessment.
Does Copilot replace a custom AI integration?
No. Copilot speeds up internal office work. AI features in your own product or website, such as semantic search or editorial assistants, need a direct integration of the model APIs into the platform.
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