MC1330891 – M365 Change Digest

One-line summary

Breakout rooms in Microsoft Teams meetings now support up to 1,000 attendees, enabled by default, removing prior meeting size limits for utilizing breakout rooms.

Similar updates

Details

RoadmapIds

560320

FeatureStatusJson

{"0":[{"RoadmapId":0,"McPostId":"MC1330891","Platform":"Desktop","Status":"FeatureRolloutStatusNotSupported","LastUpdateTime":"2026-08-05T03:00:26.9859598Z","LatestRing":null,"TenantRolloutRing":null},{"RoadmapId":0,"McPostId":"MC1330891","Platform":"Mac","Status":"FeatureRolloutStatusNotSupported","LastUpdateTime":"2026-08-05T03:00:26.9859598Z","LatestRing":null,"TenantRolloutRing":null},{"RoadmapId":0,"McPostId":"MC1330891","Platform":"All","Status":"FeatureRolloutStatusNotSupported","LastUpdateTime":"2026-08-05T03:00:26.9859599Z","LatestRing":null,"TenantRolloutRing":null}]}

Summary

Microsoft Teams now supports breakout rooms in meetings with up to 1,000 attendees, allowing up to 200 breakout rooms per meeting. Rollout begins early July 2026 for Targeted Release and mid-August 2026 for General Availability. No action is required; the feature is enabled by default.

Platforms

Desktop, Mac

Body (from Message Center)

Updated August 4, 2026: We have updated the timeline. Thank you for your patience.

[Introduction]

Microsoft Teams is expanding breakout room capacity to support larger meetings. With this update, breakout rooms can be used in meetings with up to 1,000 attendees, allowing organizers to run large meetings while still enabling smaller group collaboration. This change removes the need to limit meeting size in order to use breakout rooms.

This message is associated with Microsoft 365 Roadmap ID 560320.

[When this will happen]

Targeted Release: Rollout begins in early July 2026 and is expected to complete by late July 2026.
General Availability (Worldwide, GCC, GCCH, and DoD): Rollout begins in mid-August 2026 (previously July) and is expected to complete by late September 2026 (previously late July).

[How this affects your organization]

Who is affected

Meeting organizers and participants using Microsoft Teams
Microsoft 365 tenants

What will happen

Breakout rooms will be supported in meetings with up to 1,000 attendees.
Organizers can create up to 200 breakout rooms per meeting.
Organizers no longer need to limit meeting size to enable breakout rooms.
The feature is enabled by default and respects existing Teams meeting policies.
There is no change to the breakout room experience for meetings under the previous 300‑attendee limit.

[What you can do to prepare]

No action is required.
Consider informing meeting organizers and training owners about the expanded breakout room capacity.
Update any internal guidance or training materials that reference breakout room attendee limits.

[Compliance considerations]

No compliance considerations identified. Review as appropriate for your organization.

Raw JSON (for debugging)

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{
  "snapshot_item": {
    "action_required_by": null,
    "ai_action_required_by": "2026-07-01T00:00:00Z",
    "ai_actions": [
      "Inform meeting organizers and training owners",
      "Update internal guidance or training materials"
    ],
    "ai_master_tags": [
      "User",
      "Admin"
    ],
    "ai_model": "gpt-4.1",
    "ai_summary": "Breakout rooms in Microsoft Teams meetings now support up to 1,000 attendees, enabled by default, removing prior meeting size limits for utilizing breakout rooms.",
    "ai_topics": [
      "Teams"
    ],
    "category": "stayInformed",
    "details_map": {
      "FeatureStatusJson": "{\"0\":[{\"RoadmapId\":0,\"McPostId\":\"MC1330891\",\"Platform\":\"Desktop\",\"Status\":\"FeatureRolloutStatusNotSupported\",\"LastUpdateTime\":\"2026-08-05T03:00:26.9859598Z\",\"LatestRing\":null,\"TenantRolloutRing\":null},{\"RoadmapId\":0,\"McPostId\":\"MC1330891\",\"Platform\":\"Mac\",\"Status\":\"FeatureRolloutStatusNotSupported\",\"LastUpdateTime\":\"2026-08-05T03:00:26.9859598Z\",\"LatestRing\":null,\"TenantRolloutRing\":null},{\"RoadmapId\":0,\"McPostId\":\"MC1330891\",\"Platform\":\"All\",\"Status\":\"FeatureRolloutStatusNotSupported\",\"LastUpdateTime\":\"2026-08-05T03:00:26.9859599Z\",\"LatestRing\":null,\"TenantRolloutRing\":null}]}",
      "Platforms": "Desktop, Mac",
      "RoadmapIds": "560320",
      "Summary": "Microsoft Teams now supports breakout rooms in meetings with up to 1,000 attendees, allowing up to 200 breakout rooms per meeting. Rollout begins early July 2026 for Targeted Release and mid-August 2026 for General Availability. No action is required; the feature is enabled by default."
    },
    "id": "MC1330891",
    "importance": 4,
    "is_major_change": false,
    "last_modified": "2026-08-04T16:27:59Z",
    "ms_products": [
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    ],
    "platforms": "Desktop, Mac",
    "roadmap_ids": [
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    "services": [
      "Microsoft Teams"
    ],
    "severity": "normal",
    "tags": [
      "Updated message",
      "New feature",
      "User impact",
      "Admin impact"
    ],
    "title": "(Updated) Microsoft Teams: Breakout rooms now supported in meetings with up to 1,000 attendees"
  }
}