Outlook Calendar MCP
In one line: Connect your Microsoft Outlook calendar so your UnleashX agent can check availability, schedule meetings, update or cancel events, and manage multiple calendars for you.
| Category | Productivity |
| Authentication | OAuth (Microsoft 365 / Microsoft Graph) |
| Setup time | ~2 minutes |
| Difficulty | Easy |
| Best for | Anyone who wants an AI agent to book meetings, manage their schedule, and keep multiple Outlook calendars organized |
1. Overview
Outlook Calendar is Microsoft’s scheduling service inside Microsoft 365. It holds your meetings, appointments, and reminders across one or more calendars, and it’s tightly tied to your Outlook mailbox. Once connected to UnleashX, your agent can look up what’s on your schedule, find a free slot, create a new event with attendees, reschedule or update meetings, and cancel events you no longer need. It can also work across multiple calendars — for example a personal calendar and a shared team calendar. Connecting Outlook Calendar to UnleashX means scheduling happens in plain language. Instead of clicking through the calendar grid, you can ask “set up a 30-minute call with Sam on Thursday afternoon” and the agent finds the time and creates the event.2. What you’ll need
- A Microsoft account with Outlook Calendar (personal
@outlook.com/@hotmail.com, or a Microsoft 365 / Exchange Online work or school account). - Permission to use that calendar — for work accounts, your organization must allow third-party apps via Microsoft Graph.
- An UnleashX account with access to Data Connectors.
No API key required. Outlook Calendar uses OAuth — you click Authorize and sign in with Microsoft.
3. Get your credentials
There’s no key to copy. Authentication runs through Microsoft’s secure OAuth sign-in.Start the connection in UnleashX
Connecting Outlook Calendar (Section 4) opens a Microsoft Authorize window.
Sign in with Microsoft
Sign in with your Microsoft 365 / Outlook account at
https://login.microsoftonline.com and complete MFA if prompted.Review and accept the permissions
Microsoft displays exactly what UnleashX requests (see the scopes table). Click Accept.
Permissions (Microsoft Graph scopes) UnleashX requests:
| Scope | Why UnleashX needs it |
|---|---|
Calendars.ReadWrite | View your events and create, update, or delete them across your calendars. |
Calendars.Read | Read calendar details and check availability when only reading is needed. |
User.Read | Identify the signed-in account so events are created as you. |
offline_access | Keep the connection active by refreshing access without repeated sign-ins. |
These are standard Microsoft Graph delegated scopes, enforced by Microsoft. UnleashX can never exceed the access you approve.
4. Connect on UnleashX
5. Available tools
| Tool | What it does | Changes data? |
|---|---|---|
| Search Events | Searches your calendars for matching events. | No |
| Get Event | Retrieves the details of a single event. | No |
| Create Event | Creates a new calendar event, optionally with attendees. | ✏️ Yes |
| Update Event | Updates an existing event (time, title, attendees, etc.). | ✏️ Yes |
| Delete Event | Deletes / cancels a calendar event. | ⚠️ Yes |
| List Events | Lists events within a date range. | No |
| List Calendars | Lists all calendars on the account. | No |
| Get Calendar | Retrieves details of a specific calendar. | No |
| Create Calendar | Creates a new calendar. | ✏️ Yes |
| Update Calendar | Updates a calendar’s name or settings. | ✏️ Yes |
| Delete Calendar | Deletes a calendar. | ⚠️ Yes |
6. Example usage
“What’s on my calendar tomorrow, and book a 1:1 with Alex at the first free hour?” → Runs List Events to read tomorrow’s schedule, then Create Event to book the 1:1. “Move my 3pm design review to Friday and add Maria as an attendee.” → Runs Search Events to find the meeting, then Update Event to reschedule and add the attendee.7. Permissions & data access
UnleashX can:- Read, search, and list events across your calendars.
- Create, update, and delete events.
- List, create, update, and delete calendars on your account.
- Access your email, contacts, or other Microsoft 365 services — only calendar data within the approved scopes.
- Read calendars that haven’t been shared with the signed-in account.
- Change your Microsoft password or account security settings.
https://account.microsoft.com/privacy/app-access (or your org’s My Apps portal for work accounts). Disconnecting revokes access immediately.
8. Troubleshooting
| Problem | What it means | How to fix it |
|---|---|---|
| 401 Unauthorized | Your Microsoft sign-in expired or the token is invalid. | Reconnect Outlook Calendar in Data Connectors and sign in again. |
| 403 Forbidden | A required calendar permission wasn’t granted, or your org blocked it. | Reconnect and accept all permissions; for work accounts ask your admin for admin consent. |
| ”Need admin approval” | Your organization requires admin consent for third-party apps. | Forward the consent request to your Microsoft 365 administrator. |
| Event not found | The event was moved, deleted, or is on a calendar you can’t access. | Ask the agent to list recent events or specify which calendar to use. |
| Cannot create event | The chosen calendar is read-only or the time conflicts with a policy. | Pick a calendar you own and confirm the time is valid. |
9. Frequently asked questions
Is my calendar data stored by UnleashX? No. UnleashX reads and writes events live through Microsoft Graph for each request; it doesn’t keep a copy of your calendar. Can multiple team members connect their own calendars? Yes. Each person authorizes their own Microsoft account, so the agent works against each user’s own calendars. Can the agent manage shared or team calendars? Yes, as long as those calendars are shared with the signed-in account and the granted scopes allow editing. Will deleting an event cancel it for attendees? Deleting an event you organize generally sends cancellations, the same as deleting it in Outlook. Treat Delete Event as a real cancellation.10. References
- Microsoft Graph calendar API: https://learn.microsoft.com/en-us/graph/api/resources/calendar
- Microsoft Graph permissions reference: https://learn.microsoft.com/en-us/graph/permissions-reference
- Manage app access / revoke (personal): https://account.microsoft.com/privacy/app-access
- Microsoft sign-in: https://login.microsoftonline.com