Microsoft 365 Copilot

What it is

Microsoft 365 Copilot is the paid, per-seat AI layer across Word, Excel, PowerPoint, Outlook and Teams, plus a chat app grounded in your tenant’s mail, files, meetings and chats through Microsoft Graph (Microsoft now calls that grounding layer Work IQ). The licence is still sold as Microsoft 365 Copilot; the app people open is now just “Microsoft Copilot”, after Microsoft folded the Microsoft 365 app and its consumer Copilot app into one experience in 2026, keeping work and personal accounts separate.

Three things changed in 2026 that matter more than the rename. Agent Mode in Word and Excel builds and edits whole documents and models rather than drafting a paragraph at a time. Model choice is real: admins can enable Anthropic’s Claude models alongside OpenAI’s in Researcher, the Office apps and Copilot Studio, from the Microsoft 365 admin center. And Copilot Cowork, the multi-step task agent, went GA — but it is off by default and bills separately in Copilot Credits.

It is not the same thing as Copilot Chat, the free web-grounded chat every Entra account gets. In tenants above 2,000 users, Microsoft has restricted Copilot inside Word, Excel, PowerPoint and OneNote to paid licence holders (Message Center MC1253858, spring 2026); free Copilot Chat stays on the web, in Teams and in Outlook.

Why ops teams end up here

The question is almost always the same: we already pay for Microsoft 365 — is the Copilot seat enough, or do we still need Claude, Glean or ChatGPT Enterprise? The case for the seat is that it lives where the work already is. A RevOps lead asks Copilot in Teams to summarise every thread and meeting about the Contoso renewal; a legal-ops manager has it compare a redline in Word against the playbook sitting in SharePoint; a recruiting coordinator gets a Teams interview debrief drafted from the transcript. None of this needs a new login, a new security review or a connector project, because Copilot honours the permissions SharePoint and Exchange already enforce.

Pricing reality

List prices, checked on Microsoft’s pricing pages today:

• Microsoft 365 Copilot (enterprise) — $30/user/month on annual billing, $31.50 paid monthly. Requires a qualifying Microsoft 365 or Office 365 base licence.
• Microsoft 365 Copilot Business (up to 300 seats) — $21/user/month annual, $25.20 monthly. A first-year promotion at $18 runs through 31 December 2026 for existing Microsoft 365 Business customers.
• Bundles — Business Standard with Copilot at $23.50 and Business Premium with Copilot at $32 per user/month, annual.
• Copilot Cowork and custom agents — metered in Copilot Credits on top of the seat ($0.01/credit pay-as-you-go; see Copilot Studio for the rate card).

The list price is not what large buyers pay. Microsoft partner promotions offered 15% off at 300+ seats and 30% at 1,000-9,999 seats through 30 September 2026, and a 15% three-year-commit offer (300+ seats) runs to 31 December 2026. The Information reported in late September that Microsoft is moving to roughly 30% off at 1,000+ seats and 50% at 10,000+, tied to usage-based charges; Microsoft has not published those terms, so treat them as negotiating anchors, not a price. Independent licensing advisers report effective enterprise rates between $19 and $30 per seat.

A worked band: 200 knowledge workers on Microsoft 365 E3 at list is 200 × $30 × 12 = $72,000/year for Copilot alone, before any Cowork credits. The same 200 seats on Claude Team standard seats at $20 annual would be $48,000; on Gemini Enterprise Business from $21, about $50,400.

Best for

An IT or ops leader at a Microsoft 365 E3/E5 organisation of 300-10,000 employees whose knowledge lives in Outlook, Teams, SharePoint and OneDrive, and who needs an assistant that passes security review on day one. The use case where it wins outright: meeting-heavy roles — account managers, CSMs, legal-ops and recruiting coordinators — where Teams recap, inbox triage and document drafting from tenant files are most of the value.

Not for

A Google Workspace shop, a 20-person team on Microsoft 365 Business Basic, or an ops team whose real work is in Salesforce, HubSpot or Slack rather than in Microsoft documents. It is also the wrong primary tool for heavy analysis, long-form research or automation work: the assistant answers well over your tenant, but power users who build with AI daily routinely end up with a second seat anyway.

Versus the alternatives

• ChatGPT Business / Enterprise — the other market-share leader. Pick it when your power users want the strongest general assistant, custom GPTs and Codex, and your documents are spread across Google Drive, Notion and Slack rather than SharePoint.
• Gemini Enterprise — the direct equivalent for Google Workspace, from $21/seat. If identity and mail live at Google, buy it instead; Copilot’s advantage is entirely the Microsoft tenant.
• Claude — the fastest-growing entrant among the people who build with AI. Pick Claude Team or Enterprise (and Claude Cowork) for analysts, ops engineers and legal teams doing long-document reasoning and agentic work. The common pattern is Copilot for everyone, Claude premium seats for the 10-20% who build.
• Glean — pick it when the problem is search across 50+ non-Microsoft SaaS apps with consistent permissions; at about $40-50/seat with a 100-seat minimum it costs more, and Copilot’s 100+ Graph connectors now cover the common cases.

Watch-outs

• Copilot surfaces whatever permissions already allow. Oversharing in SharePoint — “Everyone except external users” sites, stale links — becomes an AI search problem the day you license it. Guard: run SharePoint Advanced Management (included with the licence) data-access-governance reports and restricted content discovery on the top oversharing sites before rollout, not after.
• Hidden instructions in documents can steer it. In July 2026 researcher Håkon Måløy showed a self-propagating prompt in white-on-white text that made Copilot for Word alter financial figures and copy the payload into new documents; partial mitigations shipped but the class was still exploitable at disclosure. Guard: keep a human check on every Copilot-edited figure in contracts, forecasts and board material, and apply Purview sensitivity labels so finance and legal libraries are not pulled in as automatic grounding.
• The seat is not the whole bill. Cowork, custom agents and autonomous triggers bill Copilot Credits on top of $30. Guard: set tenant, group and user spending limits in the admin center before enabling Cowork, and budget credits as a separate line.
• Adoption, not licensing, is where the money is lost. Seats bought for everyone and used weekly by a minority are the most common Copilot regret. Guard: license a 10-15% pilot, track Copilot Analytics active-use per user for 60 days, and expand only to roles that cleared a usage threshold you set in advance.

Related: the enterprise AI rollout stack shows where Copilot sits next to Copilot Studio for building agents and Microsoft Agent 365 for governing them.