Microsoft Copilot in Outlook

What it does

Copilot in Outlook is Microsoft’s AI assistant built directly into the Outlook client, adding features like AI-drafted replies, tone coaching before you send, thread summaries, and inbox prioritization. It’s aimed at organizations already using Microsoft 365 who want AI email capabilities without adopting a separate third-party tool.

Because it’s tied to Microsoft’s licensing structure, access and feature depth depend heavily on which Microsoft 365 and Copilot plan an organization has — a lightweight Copilot Chat is available to many existing subscribers at no extra cost, while the full drafting, coaching, and prioritization features typically require a paid Copilot add-on. Microsoft has also begun rolling out more autonomous, agentic inbox-management features in limited preview during 2026, extending the assistant beyond drafting into more hands-off triage and calendar coordination.

Ideal users

• Organizations already on a qualifying Microsoft 365 plan who want AI email features without adding a new vendor
• Outlook users who want inbox prioritization and thread summaries built into the client they already use
• Enterprise teams that need AI features governed under existing Microsoft 365 compliance and admin controls

Who should avoid it

• You're not on Microsoft 365/Outlook — this is Outlook-specific and doesn't apply to Gmail users
• You want the deepest AI email personalization available — dedicated tools like Superhuman or Shortwave go further on tone-matching and automation
• Your organization isn't ready to pay for the Microsoft 365 Copilot add-on license, since most full features require it beyond basic free Copilot Chat

Key features

• Draft with Copilot generates full email drafts from a prompt, using thread context and organizational information
• Coaching by Copilot reviews outgoing drafts and suggests improvements to tone, clarity, and reader sentiment
• Summarize condenses long email threads into key points
• Prioritize My Inbox flags high-priority messages based on sender, content, and context
• Agentic capabilities in preview (Frontier program, spring 2026 rollout) for more autonomous triage and calendar coordination

Pricing

Paid — $18/user/month (Microsoft 365 Copilot Business add-on, billed annually; promotional rate through September 2026, regular price $21/user/month); the no-seat-limit Enterprise add-on is $30/user/month annual. A limited Microsoft 365 Copilot Chat remains available at no extra cost to eligible existing Microsoft 365 subscribers.

Pricing and packaging for Microsoft 365 Copilot change frequently and vary by region, licensing agreement, and promotional period. Confirm current tiers and whether Outlook-specific features require the full Copilot add-on on microsoft.com/microsoft-365-copilot/pricing before publishing figures.

Typical workflows

• An executive assistant uses Prioritize My Inbox to surface high-priority messages first, then uses Draft with Copilot to generate first-pass replies that Coaching by Copilot reviews for tone before sending.

Integrations

• Microsoft Outlook (desktop, web, and mobile)
• Microsoft Teams and Microsoft 365 Calendar (for meeting preparation and scheduling features)
• Broader Microsoft 365 Copilot ecosystem (Word, Excel, PowerPoint) under the same license

Privacy & security notes

Microsoft's official Copilot privacy documentation confirms that prompts, responses, and Microsoft Graph data — including Outlook email and calendar content used to ground Copilot's responses — are not used to train foundation LLMs. Customer content is logically isolated per tenant through Microsoft Entra authorization and role-based access control, and EU customers' Copilot traffic stays within the EU Data Boundary (Anthropic-model calls are currently excluded from the EU Data Boundary).