check before: 2025-10-01
Product:
Entra, Microsoft 365 Apps, Microsoft Loop, OneDrive, SharePoint, Teams, Windows
Platform:
Mac, Online, Web, Windows Desktop, World tenant
Status:
Rolling out
Change type:
Feature update, Admin impact
Links:
Details:
Summary:
Microsoft Teams now enables automatic file and Loop component sharing by default in external 1:1, group, and meeting chats, improving collaboration. Admins can disable this via policy. Guest users can share files from their home tenant. Rollout starts October 2025, completing worldwide by January 2026.
Details:
[Introduction]
We're improving external collaboration in Microsoft Teams by enabling file attachments and Loop sharing in 1:1, group and meeting chats with external users. This update improves the collaboration experience for Files and Loop and add a new control for IT admins. Specifically, Files and Loop components will be shared automatically with external participants in the chat and won't require any action by the sender by default. Additionally, Entra B2B Guests in your organization will be able to attach and share files from their home tenant's OneDrive or SharePoint.
This change applies to Teams for Windows desktop, Mac desktop, and web and is associated with Roadmap ID 492625.
Screenshot 1: Files are automatically provisioned.
Screenshot 2: Files shared have an external label and always open on Web.
[When this will happen:]
Targeted Release: Rollout begins late October 2025; expected to complete by mid-November 2025
General Availability (Worldwide): Rollout begins mid-January 2026
Change Category:
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Scope:
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Release Phase:
Standard Release
Created:
2025-10-31
updated:
2025-10-31
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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linked item details
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Pictures
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summary for non-techies**
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Direct effects for Operations**
Automatic File Sharing in External Chats
Users may unintentionally share sensitive files with external participants, leading to potential data breaches or compliance issues.
- roles: IT Admin, Compliance Officer
- references: https://learn.microsoft.com/powershell/module/microsoftteams/set-csteamsmessagingpolicy?view=teams-ps#-autosharefilesinexternalchats, https://learn.microsoft.com/powershell/module/teams/set-csteamsfilespolicy?view=teams-ps#-filesharinginchatswithexternalusers
User Experience with External Collaboration
Users may face confusion regarding file permissions and sharing settings, leading to frustration and decreased productivity.
- roles: End User, Team Leader
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=492625, https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration
Increased Administrative Overhead
IT admins will need to manage new policies and settings to control file sharing, increasing workload and potential for misconfiguration.
- roles: IT Admin, Security Officer
- references: https://learn.microsoft.com/powershell/module/microsoftteams/set-csteamsmessagingpolicy?view=teams-ps#-autosharefilesinexternalchats, https://learn.microsoft.com/powershell/module/teams/set-csteamsfilespolicy?view=teams-ps#-filesharinginchatswithexternalusers
Configutation Options**
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Opportunities**
Enhanced Collaboration Control
With the automatic file and Loop component sharing enabled by default, IT admins can streamline external collaboration while maintaining control over data sharing. This reduces the administrative burden of managing file permissions for external chats, allowing for a more efficient workflow.
- next-steps: Evaluate current Teams messaging policies and consider enabling the automatic sharing feature for external chats to enhance collaboration. Provide training for users on managing permissions effectively if they choose to disable automatic sharing.
- roles: IT Admins, Collaboration Managers, Project Managers
- references: https://learn.microsoft.com/powershell/module/microsoftteams/set-csteamsmessagingpolicy?view=teams-ps#-autosharefilesinexternalchats, https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration
Streamlined Guest User Experience
Allowing guest users to share files from their home tenant's OneDrive or SharePoint enhances user experience and encourages collaboration without compromising security. This can lead to increased productivity and satisfaction among users working with external partners.
- next-steps: Review the organization's B2B guest access policies to ensure they align with the new capabilities. Consider implementing training sessions for guest users to familiarize them with the file sharing process in Teams.
- roles: User Experience Managers, IT Admins, Team Leaders
- references: https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration
Policy Management Optimization
The ability to disable automatic file sharing provides flexibility in managing external collaborations. This can help organizations maintain compliance and control over sensitive information while still enabling efficient communication when needed.
- next-steps: Develop a clear policy framework for managing external collaborations, including guidelines on when to enable or disable automatic file sharing. Conduct regular audits to ensure compliance with these policies.
- roles: Compliance Officers, IT Admins, Security Officers
- references: https://learn.microsoft.com/powershell/module/teams/set-csteamsfilespolicy?view=teams-ps#-filesharinginchatswithexternalusers
Potentional Risks**
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Data Protection**
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IT Security**
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Hypothetical Work Council Statement**
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DPIA Draft**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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