How to
How to connect Claude to Outlook
Outlook is the inbox most Microsoft 365 teams live in, and Claude can already read a lot of it. The question is what happens when you want the reply drafted inside the conversation, the mail filed into folders, and the send gated on your approval.
Connect Claude to Outlook either with the default connection, which searches and reads mail, or with a custom MCP connector when you need write access. A custom build lets Claude draft replies inside the original conversation, move messages into folders, apply categories, flag for follow-up, and send once you approve, authenticated as your Microsoft account.
Key takeaways
- Outlook's default Claude connection tends to be read-leaning: Claude can search and read mail, but in-thread drafting, folder and category management, and send are often limited or unavailable.
- A custom Outlook connector adds those write actions with tools like `draft_reply`, `move_message`, `apply_category`, and a gated `send_message`.
- Claude authenticates as your own Microsoft account through OAuth 2.0, with read tools separated from write tools and the narrowest scopes the work needs.
- Outbound send always waits for your confirmation, so drafting and triage flow freely while nothing leaves your mailbox by surprise.
Can Claude connect to Outlook today?
Yes, but the default connection tends to be read-leaning. Claude can search and read your mail, which covers summaries and inbox questions. In-thread reply drafting, folder and category management, and send are often limited or unavailable, which is exactly the half of the job that gets email actually handled.
Start with the honest version: if what you want is inbox intelligence, finding the conversation, summarizing the back-and-forth, answering questions about what came in this week, the default connection may carry you. Connect it and try it first.
The friction shows up when Claude's output has to land back in Outlook. The reply it wrote still gets pasted into a compose window by you, the filing into folders still happens by hand, and nothing gets flagged or categorized on its own. A custom Outlook connector closes that gap: Claude works inside the conversation, not beside it.
The wider pattern holds beyond this one tool: in our June 2026 review of 264 business tools, 77 percent had no Claude connector at all, and none shipped full read-write out of the box.
How do I set up a custom Outlook connector for Claude?
A custom Outlook connector is built for you as a small MCP server that authenticates with OAuth 2.0 using the narrowest scopes the work needs. Read tools and write tools are separated, Claude acts as your own Microsoft account, and outbound actions like send run only after you confirm them.
The path from request to working connector:
- 1Describe the Outlook work Claude should handle: the folder structure, the categories your team uses, and which conversations it should draft replies for.
- 2We build a small MCP server with read tools (search, read message) separated from write tools (draft, move, categorize, send).
- 3You authenticate through OAuth 2.0 as your own Microsoft account, so Claude inherits your existing permissions and nothing more.
- 4Claude starts working your inbox in conversation, and outbound actions like send run only after you approve them.
Access is revocable at any time from your Microsoft account, and the connector never holds broader scopes than the work requires.
What can Claude do in Outlook with write access?
With full read-write access, Claude drafts a reply inside the original conversation with recipients and quoted history preserved, moves messages into folders, applies and removes categories, flags messages for follow-up, marks conversations read or archives them, and sends a drafted message once you approve it.
The tool set maps to the mail-and-calendar routine most Microsoft 365 users grind through by hand:
draft_replyto compose inside an existing conversation, preserving recipients and quoted history.move_messageto file mail into folders as the inbox clears.apply_categoryto apply or remove categories andflag_messageto mark follow-ups.send_messageto send a drafted message after you approve it.
Claude can also find every message matching a query and propose batched responses, so the weekly pile of similar asks becomes one review pass instead of twenty compose windows.
Will Claude send Outlook email without my approval?
No. Send is a separate, gated write action. Claude can read, draft, move, categorize, and flag as it triages, but a message leaves your mailbox only after you approve it. You decide which actions run automatically and which require a confirmation step, and you can redraw that line at any time.
In practice, most teams let search, reading, drafting, filing, and categorizing flow freely and reserve confirmations for send and anything batch-sized.
Claude only has your access
The connector authenticates as your account through OAuth and inherits your existing permissions. It never grants Claude more access to a mailbox, folder, or shared resource than you already have, and you can revoke its access at any time from your Microsoft account.
When is the default Outlook connection enough, and when is it not?
The default connection is enough when you want Claude to read: search mail, summarize conversations, and answer questions about your inbox. It stops being enough when the work needs to land back in Outlook: replies drafted in the conversation, mail filed into folders, categories applied, and send gated on your approval.
A quick self-test: watch your next ten minutes after asking Claude an Outlook question. If you read the answer and move on, the default is fine. If you then paste a reply into a compose window, drag messages into folders, and flag the follow-ups yourself, you are the write half of the connector, and a purpose-built one will do that work in place with your approval as the only remaining step.