Outlook Calendar MCP server for your AI

Accept a meeting invitation.

Run up to 20 read (GET) requests in one Microsoft Graph $batch, e.g. several events by id: [{ "url": "/me/events/ID1?$select=subject,start,end" }, ...].

Cancel a meeting you organize and email attendees a cancellation, with an optional comment.

Create an event or meeting (default calendar when calendarId is omitted).

Decline a meeting invitation, optionally proposing another time (proposedNewTime: { "start": ..., "end": ...

Delete an event (it goes to Deleted Items).

Forward a meeting invitation to new people (toRecipients) with an optional comment.

Everything on the user's calendars for a day or a period, every calendar merged and sorted by start (recurring meetings expanded): subject, time, location, organizer, attendees and responses, join link, and which calendar.

Read one event in full: subject, body (plain text; bodyFormat html for HTML), start and end in the mailbox's time zone, location, organizer, attendees and their responses, recurrence, the online meeting join link, categories, iCalUId.

What is on a calendar between two times, sorted by start: single events plus every occurrence of recurring meetings.

The occurrences of a recurring meeting between two dates (changed ones included, cancelled ones not).

List a calendar's events as stored: single events and recurring series (a weekly meeting is one row with its recurrence).

Move an event to a new time, keeping its length unless newEnd is given.

Find events by words: every event (recurring occurrences included) in a window whose subject, location, organizer, attendees, categories or notes contain all the words.

Tentatively accept a meeting invitation, optionally proposing another time (proposedNewTime).

Add or remove people (or rooms) on a meeting you organize and keep everyone else.

Change an event: time, subject, body, location, attendees, reminder, showAs, categories.

Meeting rooms that are free for a time: lists the organization's rooms (Microsoft Places), optionally by room list, capacity or building, and checks each one's free/busy.

List the organization's meeting rooms: displayName, emailAddress (to book it, invite this address or pass it as room), capacity, building, floor, audio and video devices, accessibility.

Attach files of any size (up to 150 MB each) to an event: small ones directly, larger ones through an upload session.

List an event's attachments: id, name, contentType, size, isInline (file contents are left out).

Read an event attachment: the text of documents (Word .docx, PowerPoint .pptx, Excel .xlsx, .txt, .csv, .html, .json, .ics), or an image (returned as the image).

Create a new calendar.

Read one calendar: name, color, owner, whether the user can edit or share it, and its online meeting providers.

List the user's calendars: their own and the ones others shared with them (once added in Outlook), with id, name, color, owner, canEdit and isDefaultCalendar.

Who a calendar is shared with or delegated to, and their role: id, emailAddress, role, allowedRoles (the roles that person can be given), isRemovable, isInsideOrganization.

List the user's Outlook categories (name and color) that can be put on events: use a category's displayName in an event's categories.

Share a calendar with someone, or make them a delegate of the default calendar.

The mailbox's calendar settings: time zone, working hours (days, start, end, time zone), date and time formats, language, and how delegates receive meeting messages.

Free time slots of a given length: when the user (and, for work or school accounts, the attendees) has nothing busy, inside working hours by default.

Suggest times when the user and the attendees (and optionally a room) are all free.

Free/busy for people, rooms or distribution lists over a time window: each one's busy blocks (status, and subject and location where allowed), working hours and an availabilityView string.

Count a calendar's events (single events and recurring series; occurrences are not counted).

Dismiss an event's reminder (it stops reminding).

Which calendar an event is on: the calendar's id, name, color and owner.

Track what changed on a calendar between two dates: the first round returns every event, later rounds only events added, changed or deleted since (deleted ones carry @removed).

Permanently delete an event: it skips Deleted Items and the user cannot recover it.

Snooze an event's reminder until a new time.

Check in to a booked desk, room or workspace, so the reservation is not released automatically.

Create a building, floor, section, desk, room or workspace in Microsoft Places.

Delete a place from Microsoft Places (Exchange administrators).

Whether someone checked in to a place for a reservation: pass the place id and the reservation event's iCalUId.

Read one place (building, floor, section, desk, room, workspace) by its id: its own fields, e.g. a room's capacity, emailAddress and devices.

Read one room list (displayName, emailAddress, address).

List the organization's buildings in Microsoft Places.

List the organization's desks in Microsoft Places.

List the organization's floors in Microsoft Places.

Every place of one type under a place, e.g. all rooms in a building or all desks on a floor (up to 2,500).

List the rooms in one room list (often one building): displayName, emailAddress, capacity.

List the workspaces in one room list: displayName, emailAddress, capacity.

List the organization's room lists (groups of rooms, often one per building): displayName and emailAddress.

List the organization's sections (areas of a floor) in Microsoft Places.

List the organization's bookable workspaces (desk pools): displayName, emailAddress, capacity, mode.

Change a place's details (name, capacity, tags, address, devices...).

Delete a building's map from Microsoft Places (Exchange administrators).

Delete a fixture from a building map level (Exchange administrators).

Delete a section from a building map level (Exchange administrators).

Delete an unit from a building map level (Exchange administrators).

A building's map in Microsoft Places.

Upload a building's indoor map to Microsoft Places: the IMDF map files as one base64 ZIP (file).

A building map's footprints (IMDF footprint features: the building's outline).

A building map's levels (IMDF level features, one per floor): their ids for the unit, fixture and section tools.

The fixtures (furniture, equipment) on one level of a building map.

The sections (zones) on one level of a building map.

The units (rooms, offices) on one level of a building map, each linked to its place.

Create or update a fixture on a building map level (IMDF; Exchange administrators).

Create or update a section on a building map level (IMDF; Exchange administrators).

Create or update an unit on a building map level, e.g. link it to a room: { "placeId": "ROOM_PLACE_ID" } (IMDF; Exchange administrators).

Attach a file under 3 MB (or a link) to an event.

Count the user's calendar groups.

Count an event's attachments.

Count the calendars in a calendar group.

Create a calendar group.

Start uploading a file of 3 MB to 150 MB to an event.

Create a calendar inside a calendar group.

Delete a calendar group (not the default one).

Remove an attachment from an event.

Read one calendar group.

Read one attachment's details, and a small file's base64 contentBytes (large contents are left out).

The raw content of an event attachment: a text file or an attached email as text; for PDFs, images and Office files use outlook_calendar_read_attachment, which decodes what it can.

List the user's calendar groups (how Outlook groups calendars, e.g. My Calendars, Other Calendars): id and name.

List the calendars in one calendar group.

Rename a calendar group: { "name": "New name" }.

Count the user's calendars.

Delete a calendar and the events on it.

Track which calendars were added, renamed or deleted: the first round returns every calendar, later rounds only the changes (deleted ones carry @removed).

Permanently delete a calendar and its events: they cannot be recovered.

Rename a calendar or change its color.

Count a calendar's sharing entries.

Count the user's Outlook categories.

Count the open extensions on an event.

Create an Outlook category: { "displayName": "Client meetings", "color": "preset4" }.

Store custom data on an event as an open extension: { "extensionName": "Com.Contoso.Referral", ...your fields }.

Have Microsoft call an HTTPS webhook when events change.

Delete an Outlook category.

Delete an open extension from an event.

Delete a subscription: Microsoft stops calling its webhook.

Read one sharing entry of a calendar: who, role, allowedRoles.

Read one Outlook category (name and color).

Read one open extension on an event, by its extensionName.

Read one subscription (resource, changeType, notificationUrl, expirationDateTime).

List the open extensions (custom app data) stored on an event.

List the change-notification subscriptions this app holds for the signed-in user.

Reauthorize a subscription after Microsoft sent a reauthorizationRequired lifecycle notification.

Stop sharing a calendar with someone, or remove a delegate.

Renew a subscription before it expires: { "expirationDateTime": "..." } (under 7 days ahead for calendar), or change its notificationUrl.

Change the role of someone a calendar is shared with, e.g. { "role": "write" }.

Change an Outlook category's color: { "color": "preset7" } (the name cannot change).

Update an open extension on an event: the fields sent replace the stored data.

The languages and locales the mailbox supports.

The time zones the mailbox's server supports, as Windows names (alias and displayName).

The supported time zones in one naming standard: Windows (Pacific Standard Time) or Iana.

Change the mailbox's time zone, working hours, date or time format, or how delegates receive meeting messages.

The reminders that fire between two times: each event's subject, start, end, location and when its reminder fires.