BCC at mbuf Jahreskongress 2026: Guest Governance in Microsoft 365

From September 28 to 30, 2026, the Microsoft Business User Forum (mbuf) community gathers at the Darmstadtium for its annual congress. BCC is on site as a sponsor and will show, in a dedicated session, how to get a grip on one of the largest unmanaged attack surfaces in Microsoft 365: guest accounts.

Why guest governance is a priority now

Guest accounts with no expiration date. External partners who were never deactivated once a project ended. Suppliers with permanent access to Teams channels nobody reviews anymore. In most M365 environments, external users are the largest unmanaged attack surface, and Copilot makes the risk worse still: AI follows permissions, including those of guests.

That is exactly where the BCC session at mbuf Jahreskongress picks up.

The session: Guests in Microsoft 365, from risk to self-service governance

Using a real customer project, BCC shows how a nationwide business association rolled out secure guest user management for 13,000 members in just two weeks.

The approach is called self-service governance: business units manage their own guests, following clear IT rules and without a ticket queue. The session covers the challenges along the way and shows how controlled self-service brings together security, scalability, and user adoption.

Attendees leave with practical, field-tested recommendations and quick wins they can apply directly to their own M365 environment.

Session title: Guests in Microsoft 365: From Risk to Self-Service Governance

Date and time: Tuesday, September 29 | 12:25 | Spectrum C, mbuf Jahreskongress 2026

Location: Darmstadtium, Darmstadt

What you will take away

• A realistic picture of the risk landscape: why guest accounts are often the largest, yet least monitored, attack surface in M365
• Concrete insights from a project covering 13,000 managed guests, delivered in just two weeks
• A governance model that involves business units instead of overloading IT with tickets
• Quick wins you can apply to your own Microsoft 365 environment right away

Visit BCC on site

Beyond the session, BCC will be present as a sponsor at a booth throughout the congress. The team is on hand for questions about guest user management, Microsoft 365 governance, and the BCC Guest Management solution.

Want to talk on site? Schedule a meeting with BCC at mbuf Jahreskongress 2026.