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Metis Suite vs Outlook with Copilot
Outlook with Copilot is Microsoft's email and calendar app with Copilot for drafting, summarizing and triaging mail, included in Microsoft 365 consumer plans and sold to businesses as Copilot add-ons. New Outlook also adds Gmail and IMAP accounts. Metis Suite is open source and self-hostable, adds Zoho, CalDAV and file drives such as Google Drive, S3 and SFTP, runs its agent on the model you choose, and asks before every send or delete.
Outlook with Copilot facts checked on October 21, 2026
| Feature | Metis Suite | Outlook with Copilot |
|---|---|---|
| License | Open source, AGPL-3.0-or-later Source | Proprietary Source |
| Self-hosting | Yes, with Docker Compose on your own Linux server, or run for you on Metis Cloud Source | No; Copilot runs in Microsoft's cloud, and new Outlook does not support on-premises Exchange Source |
| Mail accounts | Gmail, Microsoft 365 and Outlook.com, Zoho Mail, and IMAP servers the instance owner adds Source | Microsoft 365 and Outlook.com, plus Gmail, Yahoo, iCloud and other IMAP or POP accounts in new Outlook Source |
| Calendar | Google Calendar, Outlook, Zoho Calendar and CalDAV in one view, with editing and RSVPs Source | Built-in Outlook calendar for Microsoft accounts Source |
| Files and drives | Google Drive, OneDrive, S3, WebDAV, FTP and SFTP in one explorer, with previews Source | No file browser beyond attachments Source |
| AI assistant | One agent across mail, calendars and drives; sending, deleting and every calendar, drive or workflow change waits for your approval Source | Copilot archives, deletes, moves and categorizes mail, asking first only when more than five emails are affected Source |
| AI model | Bring your own: OpenAI, Anthropic or any OpenAI-compatible endpoint, including one you run yourself Source | Microsoft-provided OpenAI and Anthropic models; no own key or local model Source |
| MCP | Built-in MCP server with OAuth for Claude, Cursor, Codex and VS Code; sending and deleting stay off until you enable them Source | Work IQ MCP server for Microsoft 365 data, with Entra ID sign-in Source |
| Automation | Visual workflows on new mail, a schedule, a manual run or before a send, with AI Ask and Branch steps Source | Outlook rules, partly available in new Outlook; Copilot can edit them after you approve Source |
| Apps | Web; desktop apps for macOS, Windows and Linux; an Android app; no iPhone app Source | Windows, Mac, web, iOS and Android; Linux through the web only Source |
| Price | Free to self-host; Metis Cloud from $10 a month billed yearly, or $12 monthly, per instance | Microsoft 365 Personal $9.99 a month; Copilot Business $21 and Microsoft 365 Copilot $30 per user a month, yearly Source |
Choose Outlook with Copilot if
Your organization runs on Microsoft 365, and you want Copilot across Word, Excel and Teams as well as Outlook.
Choose Metis Suite if
You want to self-host, choose the AI model, use Linux, or bring Google, Zoho and your own servers into the same suite.
Outlook with Copilot is made by Microsoft. Every fact about it on this page comes from its own website, documentation or source code, as linked, and was checked on October 21, 2026. Products change: if something here is out of date, write to contact@astraqcyberdefence.com and we will correct it. All trademarks belong to their owners.