Microsoft Copilot: AI Woven Deep Into Microsoft 365

Microsoft did not build AI as a separate product. It placed AI directly inside the software most companies already run: Word, Excel, Teams, and Outlook. Microsoft Copilot therefore reaches potentially the largest installed user base on the market. What sits behind the assistant, what does it cost — and what just changed fundamentally for data privacy?

Contents

• What Microsoft Copilot is — and what it is not
• Copilot in practice: Word, Excel, Teams, Outlook
• Cost and licensing models
• EU Data Boundary, Flex Routing, and GDPR
• Verdict: who Copilot pays off for
• Frequently asked questions about Microsoft Copilot
• Sources

What Microsoft Copilot is — and what it is not

Microsoft Copilot is the AI assistance layer across Microsoft 365. It summarizes, drafts, analyzes, and searches — drawing on the content in your own Microsoft account: mail, documents, calendar, chats. That access to the work context is exactly what separates Copilot from a general-purpose chatbot.

Technically, Copilot runs on OpenAI’s frontier models. Since July 2026, GPT-5.6 is the preferred model in Word, Excel, PowerPoint, and Copilot Chat (source: Microsoft, 2026). Older briefs still cite GPT-4 — that is outdated. For specific tasks, Microsoft adds its own models. The underlying LLM inference runs in Microsoft’s Azure cloud, not on local machines.

The distinction matters: Microsoft Copilot means the assistant inside the Office apps. GitHub Copilot is a separate product for software development, aimed at engineers. They share a name, not a purpose. Anyone talking about “Copilot” for daily operations almost always means the first.

Copilot in practice: Word, Excel, Teams, Outlook

Copilot’s value shows up where people already work. In Word, the assistant drafts passages and rewrites. In Excel, it helps with formulas, analysis, and interpreting data series. In Outlook, it summarizes long threads and suggests replies. In Teams, it captures meetings, extracts tasks, and answers questions about the conversation.

The real strength is not any single feature — it is reach. Microsoft 365 counts around 450 million commercial seats (source: Microsoft, 2026). For those organizations, Copilot is not an extra tool to roll out, but a function inside software already in use.

Adoption is climbing fast: 20 million paid Copilot enterprise seats were in use by the third fiscal quarter of 2026, up from 15 million in January (source: Microsoft, Q3 FY2026, Apr 29, 2026). A Microsoft-commissioned Forrester analysis reports a 116% ROI and daily time savings of 14 to 26 minutes (source: Forrester Total Economic Impact, 2026). Commissioned studies like these show potential — not an automatic outcome.

A license buys access, not impact. Whether 26 saved minutes become a measurable gain is decided by the workflow behind it — not the model.

Cost and licensing models

Copilot is a paid add-on, not a free feature. The enterprise plan costs $30 per user per month on an annual commitment (source: Microsoft, 2026). For smaller companies, the business plan runs about $21 per seat per month, with a temporary promotional price of $18 between July and September 2026.

The total price is what counts: Copilot requires a qualifying Microsoft 365 base license. The combined per-seat cost is therefore often well above the add-on price alone. Anyone budgeting for Copilot should count the sum of base and add-on license — and ask how many seats are actually used in practice. For a market overview of all providers and their pricing, see the AI tools comparison.

EU Data Boundary, Flex Routing, and GDPR

For data privacy, the baseline commitment holds first: for business customers, prompts and outputs are not used for model training. Copilot data falls under Microsoft’s Enterprise Data Protection and its data processing agreement. These commitments apply to commercial access, not to free consumer variants — a distinction OpenAI and ChatGPT draw too.

New and important is a 2026 change: with so-called Flex Routing (Microsoft message MC1269223, April 2026), Copilot requests from the EU and EFTA can, under capacity demand, also be processed outside the EU Data Boundary — enabled by default depending on configuration (source: Microsoft Learn, 2026). For organizations with strict data residency requirements, this means booking an EU tenant no longer automatically guarantees EU processing. The setting needs to be reviewed and documented.

On top sits the broader frame: despite EU data centers, Microsoft remains a US company subject to the US Cloud Act. The legal basis for transatlantic transfers, the EU-US Data Privacy Framework, is under judicial pressure in 2026. Anyone adopting Copilot should assess data processing along the same checks as with any US provider — the AI provider data privacy comparison sets that out. For organizations that want to go further, digital sovereignty is the next test.

Verdict: who Copilot pays off for

Copilot fits best for organizations already on Microsoft 365 that want to embed AI where work happens — in mail, documents, and meetings. The integration advantage is real and the entry barrier low, because no new software has to be introduced.

Copilot fits less well when the organization runs on Google Workspace or another ecosystem — there the advantage lies with Google Gemini or standalone tools. And regardless of provider: the license is the easy part. Without a defined workflow and clear ownership, the Implementation Gap remains — and then Copilot costs $30 a seat without landing on the balance sheet.

Frequently asked questions about Microsoft Copilot

Which model powers Microsoft Copilot?

Copilot uses OpenAI’s frontier models; since July 2026, GPT-5.6 is the preferred model in the Office apps. For specific tasks, Microsoft adds its own models. The earlier “GPT-4” reference is outdated.

What does Microsoft Copilot cost?

The enterprise plan costs $30 per user per month on an annual commitment; the business plan about $21. Both require a qualifying Microsoft 365 base license, billed on top.

What is the difference between Microsoft Copilot and GitHub Copilot?

Microsoft Copilot is the assistant in Word, Excel, Teams, and Outlook. GitHub Copilot is a separate product for software development. Same name, different purpose.

Is Microsoft Copilot GDPR compliant?

Business customers get Enterprise Data Protection and a data processing agreement; data is not used for training. Since 2026, however, Flex Routing can process requests outside the EU Data Boundary. The configuration and the US legal frame should be reviewed before deployment.

Does Microsoft train on my Copilot data?

No — for commercial Copilot access, prompts and outputs are not used for model training. Free consumer variants operate under different terms.

Sources

• Microsoft: Microsoft 365 Copilot — Plans and Pricing, 2026
• Microsoft: Q3 FY2026 Earnings — 20M Copilot seats, Apr 29, 2026
• Microsoft Learn: Flex routing (EU and EFTA), 2026
• Microsoft Learn: Data, Privacy, and Security for Microsoft 365 Copilot, 2026
• Forrester: Total Economic Impact of Microsoft 365 Copilot (commissioned), 2026