Calendar & External Sharing Policy

The question it answers: Can users share calendar details and contacts with outside domains, and which organisations see free/busy automatically?

Can users publish their calendar details or contacts to any outside domain, and which organisations get free/busy information automatically? Detailed calendars reveal meetings, attendees and locations.

At a glance

Where in the app	Exchange Online › Mail Security Posture › Calendar & External Sharing
Workload	Exchange Online
Kind	Findings list · dashboard tile
Data	Read from Microsoft 365 when someone first opens it, then kept for the report cache lifetime (Settings > Data & cache, 1 hour unless changed). It reads through PowerShell (Exchange Online or SharePoint Online), so the first load takes longer than a Graph report.
Licence	Exchange Online.
Report id (API and MCP)	exchange.posture.sharing-policies

Columns

Column	Key	Type
Severity	Severity	Status
Area	Category	Text
Subject	Subject	Link
Setting	Setting	Text
Current value	Value	Text
Assessment	Finding	Text
Detail	Detail	Text
Date	When	Date
Count	Number	Number

A findings list hides columns that no row fills. Severity is Critical, Serious, Warning, OK or Info; rows rated Critical, Serious or Warning need attention (Working with findings).

What it needs

Licence: Exchange Online.

Application permissions on the IntensiveReports app registration (all permissions):

Permission	API	What it allows	Note
Exchange.ManageAsApp	Office 365 Exchange Online	Manage Exchange As Application

Data sources it reads

• Get-SharingPolicy
• Get-OrganizationRelationship

Through the API and MCP

GET /ir-api/v1/reports/exchange.posture.sharing-policies?size=100

An AI assistant reads it with the MCP tool get_report and the id exchange.posture.sharing-policies. The client needs the Read grant for Exchange Online. See Using the API.