Outlook calendar | Operate As Docs

Website: outlook.com
Connects by: Signing in with Microsoft
Category: Calendars and meetings
Part of: Microsoft
Tools: 677

Service	Key	Base URL
Outlook calendar	`outlook-calendar`	`https://graph.microsoft.com/v1.0`

Connecting

Your client presses Connect on their link and approves on Microsoft's own screen. Operate As never sees their password.

Check they're connected

curl https://api.operate.as/v1/me/clients \
  -H "Authorization: Bearer $OPERATE_AS_API_KEY"

curl https://api.operate.as/v1/me/clients \  -H "Authorization: Bearer $OPERATE_AS_API_KEY"

Response

[
  {
    "id": "6f1c2a7e-...",
    "name": "Miller Dental",
    "services": [
      "outlook-calendar"
    ]
  }
]

[  {    "id": "6f1c2a7e-...",    "name": "Miller Dental",    "services": [      "outlook-calendar"    ]  }]

Permissions

What the client reads	Permission it asks for
See, add and change your calendar events	`Calendars.ReadWrite`
See your organization's rooms and buildings	`Place.Read.All`

Tools

Install Outlook calendar's typed package for your language:

pip install operate-as-outlook-calendar

pip install operate-as-outlook-calendar

Run outlook-calendar.get_count_attachments_1985

curl -X POST https://api.operate.as/v1/actions/outlook-calendar.get_count_attachments_1985 \
  -H "Authorization: Bearer $OPERATE_AS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "clientId": "6f1c2a7e-...",
    "input": {
      "event_id": "<event_id>"
    }
  }'

curl -X POST https://api.operate.as/v1/actions/outlook-calendar.get_count_attachments_1985 \  -H "Authorization: Bearer $OPERATE_AS_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "clientId": "6f1c2a7e-...",    "input": {      "event_id": "<event_id>"    }  }'

Shows the required inputs. Every input, with its JSON Schema: GET /v1/actions/outlook-calendar.get_count_attachments_1985

Response

{
  "status": 200,
  "data": {
    "…": "the service's own response"
  },
  "encoding": "json"
}

{  "status": 200,  "data": {    "…": "the service's own response"  },  "encoding": "json"}

Pass-through

Paths continue from https://graph.microsoft.com/v1.0. Your Operate As key goes in Authorization; the client's access is added for you.

See Pass-through requests for the full request and response format.

Call any endpoint

curl "https://api.operate.as/v1/clients/6f1c2a7e-.../outlook-calendar/..." \
  -H "Authorization: Bearer $OPERATE_AS_API_KEY"

curl "https://api.operate.as/v1/clients/6f1c2a7e-.../outlook-calendar/..." \  -H "Authorization: Bearer $OPERATE_AS_API_KEY"

Response

{
  "status": 200,
  "data": {
    "…": "the service's own response"
  },
  "encoding": "json"
}

{  "status": 200,  "data": {    "…": "the service's own response"  },  "encoding": "json"}

When access ends

Operate As renews the sign-in before it runs out and checks it daily. If Microsoft refuses to renew it, the service shows Expired, you're alerted, and your client reconnects from the same link.

See Keeping access alive and Removing access.

Calls answer

HTTP/1.1 409 Conflict
Content-Type: application/json

{
  "detail": "Miller Dental's Microsoft access ended. Send them their link to reconnect."
}

HTTP/1.1 409 ConflictContent-Type: application/json{  "detail": "Miller Dental's Microsoft access ended. Send them their link to reconnect."}

Your webhook receives

{
  "id": "evt_3f9a1c…",
  "type": "connection.expired",
  "createdAt": "2026-10-16T08:00:00+00:00",
  "data": {
    "clientId": "6f1c2a7e-...",
    "clientName": "Miller Dental",
    "provider": "microsoft",
    "services": [
      "outlook-calendar"
    ],
    "reconnectUrl": "https://…"
  }
}

{  "id": "evt_3f9a1c…",  "type": "connection.expired",  "createdAt": "2026-10-16T08:00:00+00:00",  "data": {    "clientId": "6f1c2a7e-...",    "clientName": "Miller Dental",    "provider": "microsoft",    "services": [      "outlook-calendar"    ],    "reconnectUrl": "https://…"  }}