Microsoft 365 Copilot is Microsoft's paid AI assistant embedded directly in Word, Excel, PowerPoint, Outlook, and Microsoft Teams, distinct from the free Microsoft Copilot chatbot. It is built for organizations and professionals already running Microsoft 365 who want AI drafting, analysis, and automation inside the Office apps they use every day. There is no free tier or trial: Microsoft 365 Copilot is sold as the Copilot Business add-on starting from $18 per user per month (originally $21), paid yearly, layered on top of an existing Microsoft 365 subscription.
Who builds it
Microsoft 365 Copilot is built by Microsoft as part of the Microsoft 365 productivity suite. Rather than shipping as a separate chat app, it is woven into apps such as Word, Excel, PowerPoint, Outlook, and Microsoft Teams that many organizations already run their daily work through, so AI assistance appears inside existing documents, spreadsheets, and meetings rather than in a standalone window.
Core features
- Embedded across core Office apps — works inside Word, Excel, PowerPoint, Outlook, and Microsoft Teams rather than as a separate tool.
- Copilot Business add-on — the entry paid tier, priced from $18 per user per month (originally $21), billed yearly, on top of a Microsoft 365 subscription.
- No training on customer data — Microsoft states that prompts, inputs, and responses are never used to train the underlying models.
- Permission-aware by design — Copilot inherits your existing Microsoft 365 permissions, sensitivity labels, and retention policies rather than operating outside them.
Who it is for
Microsoft 365 Copilot fits organizations already standardized on Microsoft 365 that want AI features layered onto Word, Excel, PowerPoint, Outlook, and Teams without adopting a separate assistant. Because there is no free tier and no trial available, teams cannot test it without committing to the paid Business add-on from $18 per user per month — smaller teams or individuals looking for a free way to experiment with AI in Office should plan to pay from day one, or evaluate Microsoft's free Copilot chatbot separately.
Data and privacy
Microsoft states that prompts, inputs, and responses are never used to train its models, and that Copilot inherits your existing Microsoft 365 permissions, sensitivity labels, and retention policies — so a document a user cannot access stays outside Copilot's reach, and existing retention rules keep applying. These facts do not include an explicit EU-hosting guarantee, so DACH organizations with strict data-residency requirements should confirm tenant-level data-residency and processing settings directly with Microsoft before rollout.
Bottom line
Microsoft 365 Copilot is best understood as an add-on that brings AI into the Office apps teams already run their work through, priced and licensed like an enterprise add-on rather than a consumer trial product. The lack of any free tier or trial makes it a considered purchase rather than something to test casually, so buyers should confirm per-user pricing, permission inheritance, and data-residency terms with Microsoft before committing a whole organization.