Microsoft 365

Exposes the entire Microsoft 365 ecosystem (Office, Outlook, Excel, Teams, SharePoint) through a single MCP server interface that translates tool calls into Microsoft Graph API requests. The server acts as a protocol bridge, converting MCP tool schemas into authenticated Graph API calls and marshaling responses back as structured data, eliminating the need for clients to handle OAuth, API versioning, or endpoint routing directly.

Enables reading, searching, filtering, and composing emails through Microsoft Graph's Mail API endpoints. The server translates MCP tool calls into Graph Mail resource queries (messages, folders, attachments) with support for OData filtering, pagination, and attachment handling. Supports both read operations (list, search, get message details) and write operations (send, draft, move to folders) with automatic handling of MIME encoding and attachment streaming.

Provides read and write access to Outlook calendars through Microsoft Graph's Calendar API, enabling agents to query events, create meetings, update attendees, and manage availability. The server translates MCP calls into Graph Calendar resource operations with support for recurring events, time zones, and attendee management. Handles calendar queries with date/time filtering, conflict detection, and automatic timezone normalization across different user locales.

Enables reading, listing, uploading, and managing files stored in OneDrive and SharePoint through Microsoft Graph's Drive API. The server translates MCP calls into Graph Drive resource operations with support for file metadata queries, content streaming, folder hierarchies, and version history. Handles file operations including listing directory contents, downloading file content (with streaming for large files), uploading new files, and managing permissions and sharing links.

Provides programmatic access to Excel workbooks stored in OneDrive/SharePoint through Microsoft Graph's Excel API, enabling agents to read cell values, update ranges, query tables, and execute calculations. The server translates MCP calls into Graph Excel resource operations with support for named ranges, table queries, and formula evaluation. Handles workbook sessions for transactional updates and supports both read operations (get values, query tables) and write operations (update ranges, append rows).

Enables reading and sending messages in Microsoft Teams channels and direct messages through Microsoft Graph's Teams API. The server translates MCP calls into Graph Teams resource operations with support for message queries, thread replies, and message formatting. Handles team/channel discovery, message history retrieval with pagination, and message composition with support for rich text formatting and @mentions.

Implements OAuth 2.0 authentication and token management for Microsoft Graph API access, supporting both single-tenant and multi-tenant application scenarios. The server handles token acquisition, refresh, and caching, with support for different credential types (client credentials, delegated user permissions). Manages Azure AD app registration details and automatically routes requests to the correct tenant based on authenticated user context.

Translates Microsoft Graph API errors and exceptions into human-readable MCP error responses, providing context-specific guidance for common failure scenarios. The server maps Graph API HTTP status codes and error codes (e.g., 'ErrorAccessDenied', 'ErrorItemNotFound') to actionable error messages that help agents understand why operations failed and suggest remediation steps. Handles rate limiting, permission errors, and transient failures with appropriate retry logic.