MC1182004 - Microsoft Teams: Chat with anyone with an email address

Updated May 8, 2026:November 7, 2025: We are not releasinghave added clarification for customers impacted by this feature at this time. We apologizefeature. Thank you for any inconvenience this may cause.your patience.

Introduction

Teams users in tenants with open collaboration policies have long been able to start a chat with anyone who has an email address. However, recipients without a Teams account were previously asked to sign up for one before being able to collaborate. We're introducing a new capability in Microsoft Teams for certain tenants (see ‘Who is affected’ below) that allows these recipientsusers to start a chat with anyone who has an email address—even if they’re not currently using Teams. The recipient will receive an email invitation to join the chat session as a guest— no account needed,guest, enabling seamless communication and as long as it is allowed by the tenant’s existing policy configuration.collaboration. This update simplifies external engagement and supports flexible work scenarios.

This capability will be available to small and medium business customers with a Teams Essentials, Business Basic, Business Standard, or Business Premium license.

This feature will be available across Windows, Mac, Web,Android, Desktop, iOS, Linux, and AndroidMac platforms.

This message is associated with Microsoft 365 Roadmap ID 513271.

When this will happen:

• Targeted Release: Rollout for users with the aforementioned licenses begunwill begin in early November 2025 and was completed inis expected to complete by mid-November 20252025.
• General Availability (Worldwide): We are not releasing this feature at this time. Rollout will begin in January 2026.

How this affects your organization:

Who is affected:

This capability is currently available only to small and medium business customers enrolled

• All Microsoft Teams users in public preview with a Teams Essentials, Business Basic, Business Standard, or Business Premium license. It also only affects organizations with guest chat enabled and that do not limit guest collaboration to specific domains. Organizations without users enrolled in public preview or without users with these licenses may still see this post even if they are not affected.
  your organization.

What will happen for those who are affected:happen:

• After TeamsUsers will be able to initiate chats with any external contact using their email address.
• External users start a chat with someone who is not on Teams, the recipient will receive an email inviting them toinvitation and can join the chat as a guest. Only Teams users inguests.
• The chat experience will be governed by your organization can start the chat, as users without Teams accounts cannot initiate chats.organization’s Entra B2B Guest policy.
• Chats will remain within your organization’s boundary.
• This feature iswill be enabled by default but will be governed by your organization’s Entra B2B Guest policies and Teams Admin Center Guest Access policies. It will not override any existing policy configurations..

What you can do to prepare:

• Update internal documentation to reflect this new capability.
• Inform helpdesk and support teams about the change.
• Review the documentation here: Chat with anyone not using Teams - Microsoft Teams | Microsoft Learn
• To disable the feature, set the UseB2BInvitesToAddExternalUsers attribute of TeamsMessagingPolicy to false. Set-CsTeamsMessagingPolicy documentation here.

Compliance considerations:

No compliance considerations identified, review as appropriate for your organization.