Prompt
Do I need Microsoft Graph for Outlook calendar access?
Latest observation
Oct 15, 2026
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Yes, if you’re building a modern app or integration, Microsoft Graph is generally the recommended way to access Outlook calendar data.
Use Microsoft Graph if you want to:
- Read/write calendar events
- Access calendars for Outlook.com, Microsoft 365, or Exchange Online users
- Build web, mobile, or backend apps
- Use OAuth 2.0 / Azure app registration
- Work with one API for Outlook, mail, contacts, etc.
You might not need Microsoft Graph if:
- You’re only working with Outlook desktop add-ins or VBA/COM automation
- You’re using older legacy APIs like Exchange Web Services (EWS) or Outlook REST API
- Note: Outlook REST API is deprecated
- EWS is still around in some environments but generally not the preferred choice for new development
Rule of thumb
- New development: use Microsoft Graph
- Legacy/internal desktop automation: maybe not, depending on the tool and environment
If you want, I can also tell you which API to use based on your exact scenario (web app, Python script, Outlook add-in, Power Automate, etc.).