First channel in new Microsoft Teams will default to threaded conversation layout

Starting May 2026, the first channel in newly created Microsoft Teams will default to the threaded conversation layout instead of Posts. This applies only to new teams, can be changed by team owners, requires no admin setup, and aims to improve conversation organization and clarity.

Introduction

We’re updating the default conversation layout for the first channel created in new Microsoft Teams. Starting in May 2026, the first channel in any newly created team will default to the Threaded (conversation) layout instead of Posts. This change aligns the first channel experience with the standard default for all newly created channels, helping teams organize conversations more effectively from the start and improving discussion clarity for project-based collaboration.

When this will happen:

• General Availability (Worldwide): Rollout will begin in early May 2026 and is expected to complete by early May 2026.

How this affects your organization:

Who is affected:

• Team owners creating new Microsoft Teams
• End users participating in newly created teams
• Microsoft 365 administrators managing Teams governance and user adoption

What will happen:

• The first channel created automatically during team creation will default to the Threaded layout.
• This change applies only to newly created teams after rollout.
• Existing teams and their channels will remain unchanged.
• Team owners can switch the first channel layout from Threaded to Posts at any time after creation.
• The feature is enabled by default and requires no admin configuration.
• There is no impact to existing Teams policies or channel moderation settings.

What you can do to prepare:

• Inform your helpdesk and Teams champions that new teams will start with the Threaded layout in the first channel.
• Update internal Teams onboarding or governance documentation if you reference default channel behavior.
• Educate team owners that they can change the channel layout after team creation if Posts are preferred.

Compliance considerations:

Area	Explanation
Does the change provide a new way of communicating between users, tenants, or subscriptions?	The change modifies the default conversation layout for the first channel created in newly provisioned Microsoft Teams from Posts to Threaded. While this does not introduce a new communication modality, it changes the default way conversations are structured and presented within the first channel of newly created teams, which may affect how users organize and review discussions.
Does the change allow a user to enable and disable the feature themselves?	Team owners can change the conversation layout of the channel after team creation. This is a per-channel user experience setting and is not controlled through tenant-level administrative policy.
Does the change alter how existing customer data is processed, stored, or accessed (e.g. documents, emails, chats, etc.)?	While no changes are made to how customer data is stored or retained, the change to a threaded layout as the default in newly created teams may influence how channel message content is displayed and interacted with by users within the Teams client.
Does the change include an admin control and, can it be controlled through Entra ID group membership?	The default layout behavior is applied automatically at team creation and there is currently no tenant-level administrative policy or Entra ID group-based control available to manage this behavior.