Side-by-Side Model Context Protocol Comparison
Outlook Calendar vs Slack Connect
In-depth architectural comparison of the Outlook Calendar and Slack Connect MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.
At a Glance & Executive Verdict
Outlook Calendar
Communication · Local stdio
Quality: 41/100 (Fair) | Auth: No auth required
Slack Connect
Communication · Local stdio
Quality: 39/100 (Fair) | Auth: No auth required
Verdict Summary: Choose Outlook Calendar if you need specialized Communication tools running via a local process. Choose Slack Connect if your workspace requires Communication integration with local subprocess execution. Both servers can be configured concurrently in your client's
mcpServers manifest.Which MCP Server Should You Choose?
O
Choose Outlook Calendar when:
- You need dedicated capabilities in the Communication domain.
- You prefer local stdio subprocess transport architecture.
- Your security boundary fits: No auth required (Free / Open Source).
- Primary tools included: list_events, get_event, list_calendars.
S
Choose Slack Connect when:
- You need dedicated capabilities in the Communication domain.
- You prefer local stdio subprocess transport architecture.
- Your security boundary fits: No auth required (Free / Open Source).
- Primary tools included: slack_list_channels, slack_channel_history, slack_send_message.
Feature & Specification Comparison
Tools & Capabilities Breakdown
Outlook Calendar Tools (5)
list_events
List upcoming events from the user's Outlook / Microsoft 365 calendar within a time window. Returns subject, start/end times, location, organizer, all-day flag, and online meeting URL for each event. Defaults to the next 7 days. Use to see what meetings or appointments are scheduled.
get_event
Get full details of a single Outlook / Microsoft 365 calendar event by its ID. Returns subject, start/end times, location, organizer, attendees, body, all-day flag, and online meeting URL. Use after list_events to inspect a specific meeting.
list_calendars
List all calendars accessible in the user's Outlook / Microsoft 365 account. Returns each calendar's ID, name, owner, edit permission, and whether it is the default calendar. Use to discover which calendars exist.
find_meeting_times
Return the user's busy time windows from their Outlook / Microsoft 365 calendar over the next N days — a lightweight free/busy view. Each window includes start, end, subject, and all-day flag. Use to find when the user is available or to identify scheduling conflicts before proposing a meeting time.
Ready-to-Paste Client Configurations
Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).
Outlook Calendar Configuration
Slack Connect Configuration