Ensure 'External sharing' of calendars is not available

Why This Matters

Allowing external calendar sharing in Microsoft 365 exposes sensitive scheduling information and meeting details to unauthorized users outside your organization. This can lead to data leakage, targeted attacks based on visible availability patterns, and compliance violations. Administrators should restrict external calendar sharing to maintain control over organizational data.

What Aether365 Checks

This check verifies that the "External sharing" of calendars is disabled for the tenant. It appears in the Aether365 dashboard under microsoft-365 checks with a severity of High.