💡 Our Technical Review in summary
Microsoft is introducing a streamlined external collaboration (EC) management experience within the Teams Admin Center (TAC). This update simplifies how administrators configure and oversee cross-organizational interactions across chats, calls, meetings, and shared channels. The new interface replaces fragmented settings with three distinct management modes: Open, Controlled, and Custom, designed to help organizations align their external access policies with their specific security and compliance requirements more efficiently.
Impact
- Administrative Experience: Admins will see a new “External Collaboration” section in the TAC providing an “at-a-glance” overview of current settings and a guided configuration wizard.
- Collaboration Modes:
- Open (Mode 1): Maximizes reach by enabling federation with all external domains and Teams personal accounts, while permitting B2B collaboration and B2B direct connect for shared channels.
- Controlled (Mode 2): Matches the standard default for Enterprise and Education tenants. It allows external federation (chats/calls) with all domains but restricts the use of shared channels.
- Custom: Allows for granular, manual configuration of org-wide policies. Note that changes in this mode specifically target Global org-wide policies and do not override existing custom user-level policies.
- Policy Persistence: Existing organizational settings will remain intact during the transition. The update changes the management interface and categorization but does not automatically modify current access levels or permissions.
- Timeline: General Availability is scheduled to begin in late February 2026, with completion expected by the end of that month.
Action Required
- Review Security Posture: Before the rollout, evaluate your organization’s current external access requirements to determine if the “Open” or “Controlled” presets meet your needs or if a “Custom” configuration remains necessary.
- Explore the New Interface: Once the update is live in late February 2026, navigate to the Teams Admin Center to familiarize yourself with the new External Collaboration overview page.
- Documentation Update: Update any internal IT SOPs (Standard Operating Procedures) or administrative training materials to reflect the new navigation path and terminology used in the updated TAC.
- No Immediate Change: No technical action is required to maintain current functionality, as existing settings will be mapped into the new interface automatically.
Microsoft Official Update
Service: N/A
Category: stayInformed
Severity: normal
Updated February 17, 2026: We have updated the timeline. Thank you for your patience.
[Introduction:]
We’re introducing a simplified external collaboration (EC) admin experience in Microsoft Teams to help administrators manage external collaboration settings more efficiently. This update introduces two predefined collaboration modes—Open and Controlled—as well as a Custom mode for organizations with unique requirements. The new experience provides a streamlined interface in the Teams admin center (TAC) for configuring external collaboration policies across chats, calls, meetings, Teams, and channels (including shared channels).
[When this will happen:]
Public Preview: Rolling out mid-November 2025; expected completion by mid-November 2025.
General Availability (Worldwide): Rolling out late February 2026 (previously mid-February); expected completion by late February 2026 (previously early February).
[How this affects your organization:]
Who is affected: Admins managing Microsoft Teams external collaboration settings.
What will happen:
- A new admin experience will be available in Teams admin center (TAC).
- Admins can choose from three collaboration modes:
- Open (Mode 1):
- Enables chats, calls, and meetings with all external domains and Teams personal accounts using federation or external access.
- Allows Teams and channels collaboration with Microsoft and non-Microsoft partners using B2B collaboration and B2B direct connect.
- Controlled (Mode 2):
- Aligns with current defaults for enterprise and EDU tenants.
- Enables chats, calls, and meetings with all external domains using federation or external access.
- Blocks collaboration in shared channels.
- Custom:
- Provides full control over each external collaboration setting.
- Allows manual configuration of org-wide external collaboration policies across chats, calls, meetings, Teams, and channels (including shared channels).
- Changes in Custom mode apply only to Global org-wide policies and settings; they do not affect custom policies.
- Existing settings will remain unchanged unless modified by the admin.
Screenshot 1 – A new external collab section and overview page that shows external collab settings at a glance:
Screenshot 2: Manage external collab settings using a guided simple UX:
[What you can do to prepare:]
No action is required at this time.
Admins may choose to explore the new interface once available to review and adjust external collaboration settings.
For more information, refer to the Teams admin center documentation once the update is live.
[Compliance considerations:]
No compliance considerations identified, review as appropriate for your organization.
