Microsoft 365 Calendar MCP server

Read from the package source without running it. The installed server may list more.

• cancel_eventwrite action

  Cancel a meeting as its organizer, optionally sending a cancellation message to all attendees. The event moves to the Deleted Items folder. Prefer this over delete_event for meetings with attendees so they are notified.

• create_eventwrite action

  Create a new calendar event.

• delete_eventwrite action

  Delete a calendar event.

• find_meeting_times

  Suggest time slots within a window when ALL given attendees are free, based on their free/busy availability. Returns candidate start/end times in the resolved timezone that can be passed directly to create_event. Include your own email address in attendees to account for your own availability. A slot is only suggested when availability for EVERY requested attendee was resolved; otherwise no slots

• get_event

  Get detailed information about a specific calendar event.

• get_free_busy

  Check availability/free-busy status for users.

• list_calendars

  List all calendars the user has access to.

• list_events

  List calendar events within a date range. Returns JSON by default (with timezoneInfo showing calendar, device, and resolved timezone). Set returnText=true for a human-readable agenda format. Pass deviceTimezone from the system prompt for fallback if calendar settings are unavailable. If the result is truncated (truncated: true), narrow the date range or raise top (max 100) to see more events.

• respond_to_event

  Accept, decline, or tentatively accept an event invitation.

• update_eventwrite action

  Update an existing calendar event.

• Code scan18 source files scanned25/25
• –Live reliabilityno gateway calls yet and no remote to proben/a
• –Tool poisoningtools not inspected (local package is not executed); not countedn/a
• Auth qualitylocal package, no credentials required12/15
• Maintenancelast push 1 days ago15/15
• Maintainer identityregistry namespace matches repository owner; GitHub account older than a year9/10

Safety score

94/100

higher than 91% of 915 Email servers

Tools

10

the typical Email server has 8

Tools that change things

40%

typical: 25%. Fewer write tools means less an agent can break

GitHub stars

14

more than 90% of 502 Email servers

Downloads a week

74

more than 41% of 270 Email servers with a package

Microsoft 365 Calendar: common questions

Is Microsoft 365 Calendar MCP server safe?

Yes, by our scan: it is graded A (94/100). Read the Microsoft 365 Calendar safety report

How do I install Microsoft 365 Calendar?

It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.

Does Microsoft 365 Calendar need an API key?

No secret keys are declared. It reads 5 settings from the environment.

Is Microsoft 365 Calendar maintained?

The last commit was 11 days ago (2026-11-04). The latest release is v0.2.0.

What can I use instead of Microsoft 365 Calendar?

Servers from other publishers that do the same job: Outlook MCP server, Outlook Assistant MCP server and Mailoo - Email MCP Server. Compare all Microsoft 365 Calendar alternatives.

How does Microsoft 365 Calendar compare with other Email MCP servers?

safety score 94/100 (higher than 91% of 915 Email servers); tools 10 (the typical Email server has 8); tools that change things 40% (typical: 25%. Fewer write tools means less an agent can break). Full comparison.