How to Integrate with Microsoft Outlook

Integrating with Microsoft Outlook using the Microsoft Graph API involves accessing various features like mail folders, messages, calendars, and events across Microsoft 365 accounts, but requires handling operational complexities such as app registration in Microsoft Entra ID, permission configurations, OAuth implementation, and managing throttling. The process includes choosing between delegated and application permissions, implementing OAuth 2.0 authorization flow, and deciding on sync options like delta queries and change notifications. While direct integration offers flexibility and control, it demands significant infrastructure work, especially for customer-facing SaaS products. Alternatively, using an integration layer like Unified can simplify the process by offering a unified interface for Outlook and other providers, handling OAuth, webhook validation, and providing standardized API calls, which can be advantageous if Outlook's features are critical but not the primary differentiator for your product.