Microsoft Graph

API

One REST API for Microsoft 365 mail, calendars, files, Teams and users

Price: Free with Microsoft 365; some metered
Access: Entra ID OAuth access token

About

Microsoft Graph is the single REST endpoint for Microsoft 365 and Entra data: Outlook mail and calendars, OneDrive and SharePoint files, Teams chats and directory users. Apps sign in through Microsoft Entra ID. Standard APIs come with user licenses; a few high-volume APIs are metered.

What you can do with it

Read and send Outlook mail on behalf of a signed-in user
Create calendar events and find meeting times across Microsoft 365 users
Sync OneDrive and SharePoint files, or post messages to Teams chats

Get started

Register an app in Microsoft Entra ID
Grant it Mail.Read or other Graph permissions
Get an access token with MSAL

Example

curl "https://graph.microsoft.com/v1.0/me/messages?\$select=sender,subject&\$top=10" \
  -H "Authorization: Bearer $GRAPH_ACCESS_TOKEN"

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: C#, JavaScript/TypeScript, Java, Go, PHP, Python
MCP server: Remote
Works with: Microsoft 365, Outlook, Microsoft Teams