Analyze external users, guest access, and collaboration patterns across Microsoft 365.
Related topics
external users
guest access
b2b collaboration
external sharing
guest audit
About this tool
The External Collaboration Report provides comprehensive analysis of all external users and guest access in your tenant. Identify B2B guests, external sharing patterns, and collaboration with outside organizations.
Analyze external access by domain to understand your organization's collaboration partnerships. Identify stale guest accounts and external sharing that may no longer be needed.
Essential for security reviews and organizations with strict external collaboration policies.
Key features
Guest user inventory
External domain analysis
Sharing pattern detection
Stale guest identification
Collaboration partnerships
Access aging reports
Domain-based filtering
Cleanup recommendations
Use cases
External access review. Understand and control external collaboration
Data sharing audit. Document external data sharing for compliance
Guest cleanup. Identify and remove stale guest accounts
Requires a paid edition (security). The Suite bundle includes this tool alongside every other capability in the catalogue.
Limitations & out-of-scope
User.Read.All and AuditLog.Read.All expose guest accounts and sharing activity, but the audit-log lookback window is bounded by whatever retention the tenant's Microsoft 365 license provides — older sharing events simply aren't in the log to find. Analysis is scoped to guest users and SharePoint sharing; Teams meeting-level external-participant activity is a separate signal this tool does not query.