feat: add Microsoft 365 Graph mail source

docs/index.md

@@ -13,7 +13,7 @@ DMARQ is a full-stack DMARC monitoring platform designed to help organizations t
 - **DMARC Report Processing**: Automatically collect and parse DMARC aggregate and forensic reports
 - **Interactive Dashboard**: Visualize compliance rates and authentication trends
 - **DNS Health Checks**: Verify your email authentication records (SPF, DKIM, DMARC)
-- **IMAP Integration**: Automatically fetch reports from your email inbox
+- **Mailbox Integrations**: Automatically fetch reports from IMAP, Gmail, and Microsoft 365 inboxes
 - **Alerting**: Get notified about important authentication issues
 - **Easy Setup**: Web-based configuration wizard for quick onboarding
 
@@ -23,4 +23,6 @@ To get started with DMARQ, please see the [Getting Started](user_guide/getting_s
 
 For installation instructions, check the [Docker Setup](deployment/docker.md) or [Manual Installation](deployment/manual.md) guides. Operators should use the [Operator Runbook](deployment/operations.md) for deployment modes, verification, upgrades, and rollback, and the [Troubleshooting Playbooks](deployment/troubleshooting.md) for ingestion, authentication, DNS, database, and notification failures. For production secrets, use [Secret Handling with 1Password](deployment/secrets.md). For database operations, use [Database Backup and Restore](deployment/backups.md). For upgrades, use the [Release Checklist](deployment/release-checklist.md).
 
+For Microsoft 365 setup, see [Microsoft 365 Mail Sources](user_guide/microsoft365.md).
+
 For aggregate-report parser support, known edge cases, and fixture guidance, see [DMARC Aggregate Format Compatibility](reference/dmarc-compatibility.md).