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:
Admin impact, Feature update, Updated message
Links:
Details:
Summary:
Microsoft Teams will enable automatic file and Loop component sharing in external 1:1, group, and meeting chats, improving collaboration. Guests can share files from their own OneDrive or SharePoint. IT admins can disable automatic sharing via policy. Rollout starts late October 2025, and completed late March 2026.
Details:
Updated March 30, 2026: We have updated the title. Thank you for your patience.
[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: File sharing option is available in external chats
Screenshot 2: Files shared have an external label and always open on Web
Screenshot 3: Teams automatically shares the file or Loop component when uploaded to external chats
Screenshot 4: User can also manually change permissions before sharing
[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:
2026-03-31
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
Without preparation, users may unintentionally share sensitive files with external parties, leading to potential data breaches.
- roles: IT Admin, End User
- references: https://learn.microsoft.com/microsoftteams/share-files-loop-in-external-chats, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=492625
User Experience with External Collaboration
Users may face confusion regarding file permissions and sharing settings, leading to frustration and decreased productivity.
- roles: End User, Project Manager
- references: https://learn.microsoft.com/microsoftteams/share-files-loop-in-external-chats, https://learn.microsoft.com/powershell/module/microsoftteams/set-csteamsmessagingpolicy?view=teams-ps#-autosharefilesinexternalchats
Compliance and Data Governance
The automatic sharing feature may lead to non-compliance with data protection regulations if sensitive information is shared without proper controls.
- roles: Compliance Officer, IT Admin
- references: https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration, https://learn.microsoft.com/powershell/module/teams/set-csteamsfilespolicy?view=teams-ps#-filesharinginchatswithexternalusers
Configutation Options**
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Opportunities**
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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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change history
| Date | Property | old | new |
| 2026-03-31 | MC prepare | 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 https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=492625 | https://learn.microsoft.com/microsoftteams/share-files-loop-in-external-chats
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 https://learn.microsoft.com/sharepoint/sharepoint-azureb2b-integration https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=492625 |
| 2026-03-31 | MC MessageTagNames | Feature update, Admin impact | Updated message, Feature update, Admin impact |
| 2026-03-31 | MC 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. | Microsoft Teams will enable automatic file and Loop component sharing in external 1:1, group, and meeting chats, improving collaboration. Guests can share files from their own OneDrive or SharePoint. IT admins can disable automatic sharing via policy. Rollout starts late October 2025, and completed late March 2026. |
| 2026-03-31 | MC Last Updated | 03/09/2026 17:15:04 | 2026-03-30T18:21:41Z |
| 2026-03-31 | MC Messages | [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 | Updated March 30, 2026: We have updated the title. Thank you for your patience.
[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: File sharing option is available in external chats Screenshot 2: Files shared have an external label and always open on Web Screenshot 3: Teams automatically shares the file or Loop component when uploaded to external chats Screenshot 4: User can also manually change permissions before sharing [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 |
| 2026-03-31 | MC Title | Microsoft Teams: File attachment control now enabled by default in external 1:1 and group chats | (Updated) Microsoft Teams: Secure file and Loop sharing in external 1:1, group and meeting chats |
| 2026-03-31 | MC How Affect | Who is affected:
All Microsoft Teams users in your organization who participate in 1:1, group, or meeting chats with external users, including guest and Teams for Free users. What will happen: With this update: Unless the user chooses to share File and Loop by pasting links, external users in chat will be automatically provisioned to allow frictionless collaboration. You can disable automatic provisioning and have the user change permissions manually by using policy controls. If disabled, users will have to manually provision the file to users in the chat. Guest users will be able to upload files from their home tenant's OneDrive and SharePoint. Files shared by external users will continue to display an External tag for clarity. Loop components will now be rendered inside external chats in Teams. Recipients will access File and Loop components as B2B guests within the resource tenant. If they are not already added as guests, they will need to give consent and might need to complete MFA, depending on your company's B2B policy, before viewing the chat content. What you can do to prepare: No action is required to enable the feature-it will be automatically available as the rollout progresses. To disable the automatic provisioning behavior for files and loops set the AutoShareFilesInExternalChats attribute of TeamsMessagingPolicy to Disabled. Learn more: Set-CsTeamsMessagingPolicy documentation. To provide seamless Loop access experience for external users, we recommend turning on Entra B2B Guest Access. Refer to: Microsoft Entra B2B integration for SharePoint & OneDrive - SharePoint in Microsoft 365 | Microsoft Learn. For configuration guidance, refer to: Set-CsTeamsFilesPolicy documentation (documentation will be updated before rollout). Compliance considerations Compliance AreaImpact New communication method between tenantsEnables file sharing in external chats, expanding cross-tenant collaboration Admin control availableAdmins can disable the feature via PowerShell Can be controlled through Entra ID group membershipPolicy can be scoped using Entra ID groups Data processing changesFiles shared in external chats are tagged and stored per existing Teams file sharing protocols | Who is affected:
All Microsoft Teams users in your organization who participate in 1:1, group, or meeting chats with external users, including guest and Teams for Free users. What will happen: With this update: Unless the user chooses to share File and Loop by pasting links, external users in chat will be automatically provisioned to allow frictionless collaboration. You can disable automatic provisioning and have the user change permissions manually by using policy controls. If disabled, users will have to manually provision the file to users in the chat. Guest users will be able to upload files from their home tenant's OneDrive and SharePoint. Files shared by external users will continue to display an External tag for clarity. Loop components will now be rendered inside external chats in Teams. Recipients will access File and Loop components as B2B guests within the resource tenant. If they are not already added as guests, they will need to give consent and might need to complete MFA, depending on your company's B2B policy, before viewing the chat content. What you can do to prepare: No action is required to enable the feature-it will be automatically available as the rollout progresses. To disable the automatic provisioning behavior for files and loops set the AutoShareFilesInExternalChats attribute of TeamsMessagingPolicy to Disabled. Learn more: Set-CsTeamsMessagingPolicy documentation. To provide seamless Loop access experience for external users, we recommend turning on Entra B2B Guest Access. Refer to: Microsoft Entra B2B integration for SharePoint & OneDrive - SharePoint in Microsoft 365 | Microsoft Learn. For configuration guidance, refer to: Set-CsTeamsFilesPolicy documentation (documentation will be updated before rollout). Review the following article: Share Files and Loop components in external (federated) chats Compliance considerations Compliance AreaImpact New communication method between tenantsEnables file sharing in external chats, expanding cross-tenant collaboration Admin control availableAdmins can disable the feature via PowerShell Can be controlled through Entra ID group membershipPolicy can be scoped using Entra ID groups Data processing changesFiles shared in external chats are tagged and stored per existing Teams file sharing protocols |
| 2026-03-17 | MC End Time | 03/02/2026 09:00:00 | 2026-05-04T10:00:00Z |
| 2026-03-17 | MC Last Updated | 10/31/2025 01:17:07 | 2026-03-09T17:15:04Z |
Last updated 2 weeks ago ago
