[FEATURE] Microsoft 365 MCP:Add support for reading email attachments

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The Microsoft 365 MCP integration currently supports searching and reading email content, but has no ability to access email attachments.

Use case: When working with forwarded research reports and data files (e.g., spreadsheets attached to market commentary emails), I need to analyze the attachment contents directly from Claude Code without manually downloading them from Outlook first. The current workflow requires context-switching out to Outlook, downloading the file, saving it locally, then pointing Claude Code at it — which defeats the purpose of having
the integration.

Suggested approach: Microsoft Graph API already supports this via:

• GET /me/messages/{id}/attachments — list attachments
• GET /me/messages/{id}/attachments/{attachmentId}/$value — download attachment content
• GET /me/messages/{id}/$value — download full MIME/EML (includes attachments)

Exposing any of these through the MCP toolset would close this gap.

Impact: This is a significant usability gap for anyone who receives data files, reports, or spreadsheets via email and wants to analyze them in-context.

Proposed Solution

Suggested approach: Microsoft Graph API already supports this via:

• GET /me/messages/{id}/attachments — list attachments
• GET /me/messages/{id}/attachments/{attachmentId}/$value — download attachment content
• GET /me/messages/{id}/$value — download full MIME/EML (includes attachments)

Alternative Solutions

N/a

Priority

High - Significant impact on productivity

Feature Category

MCP server integration

Use Case Example

Analyzing research reports with attachments which come via email

Additional Context

N?A