check before: 2026-02-01
Product:
Microsoft 365 admin center, Teams
Platform:
Online, Web, World tenant
Status:
Feature Rollout Status Not Supported
Change type:
Admin impact, New feature, Updated message, User impact
Links:
Details:
Summary:
Microsoft Teams will roll out the External domains anomalies report by mid-March 2026, helping admins detect unusual external communication. Available in the Teams admin center, it highlights abnormal activity and offers a block option. Admins can enable alerts for proactive notifications; no action is needed to access the report.
Details:
Updated January 29, 2026: We have updated the timeline. Thank you for your patience.
[Introduction]
To help admins detect unusual or potentially risky interactions with external organizations, Microsoft Teams is introducing the External domains anomalies report. This report analyzes cross-tenant communication patterns for your tenant and highlights sudden spikes or abnormal engagement activity. These insights support proactive investigation and help protect your organization while enabling secure external collaboration.
This message is associated with Microsoft 365 Roadmap ID 536572.
[When this will happen]
General Availability (Worldwide): Rolling out in early March 2026 (previously late February) and expected to complete in mid-March 2026.
Change Category:
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Scope:
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Release Phase:
Created:
2026-01-21
updated:
2026-01-30
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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summary for non-techies**
Microsoft Teams will introduce the External Domains Anomalies Report by mid-March 2026, enabling administrators to monitor and detect unusual communication patterns with external organizations directly from the Teams admin center, with options for alerts on the top five domains showing anomalies.
Direct effects for Operations**
Unusual External Communication Detection
Without preparation, the rollout of the External domains anomalies report may lead to confusion among Teams administrators regarding the interpretation of the report data, potentially resulting in mismanagement of external communications.
- roles: Teams Administrators, Compliance Officers
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=536572
Proactive Alert Configuration
If the alert system is not properly configured before the rollout, administrators may miss critical notifications about unusual external activities, leading to delayed responses to potential security threats.
- roles: Teams Administrators, IT Security Managers
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=536572
Configutation Options**
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Data Protection**
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IT Security**
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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 |
| 2026-01-30 | MC MessageTagNames | New feature, User impact, Admin impact | Updated message, New feature, User impact, Admin impact |
| 2026-01-30 | MC Summary | Microsoft Teams will roll out an External domains anomalies report by March 2026, enabling admins to detect unusual external communication patterns. Available in the Teams admin center, it provides insights and blocking options for suspicious domains. Admins can enable alerts for proactive monitoring without required action to access the report. | Microsoft Teams will roll out the External domains anomalies report by mid-March 2026, helping admins detect unusual external communication. Available in the Teams admin center, it highlights abnormal activity and offers a block option. Admins can enable alerts for proactive notifications; no action is needed to access the report. |
| 2026-01-30 | MC Last Updated | 01/21/2026 01:39:30 | 2026-01-30T00:00:36Z |
| 2026-01-30 | MC Messages | [Introduction]
To help admins detect unusual or potentially risky interactions with external organizations, Microsoft Teams is introducing the External domains anomalies report. This report analyzes cross-tenant communication patterns for your tenant and highlights sudden spikes or abnormal engagement activity. These insights support proactive investigation and help protect your organization while enabling secure external collaboration. This message is associated with Microsoft 365 Roadmap ID 536572. [When this will happen] General Availability (Worldwide): Rolling out in late February 2026 and expected to complete in March 2026. | Updated January 29, 2026: We have updated the timeline. Thank you for your patience.
[Introduction] To help admins detect unusual or potentially risky interactions with external organizations, Microsoft Teams is introducing the External domains anomalies report. This report analyzes cross-tenant communication patterns for your tenant and highlights sudden spikes or abnormal engagement activity. These insights support proactive investigation and help protect your organization while enabling secure external collaboration. This message is associated with Microsoft 365 Roadmap ID 536572. [When this will happen] General Availability (Worldwide): Rolling out in early March 2026 (previously late February) and expected to complete in mid-March 2026. |
| 2026-01-30 | MC How Affect | Who is affected:
Teams administrators can view this report for their Microsoft 365 tenant if their organization collaborates with external organizations. What will happen: A new External domains anomalies report will be available in the Microsoft Teams admin center under Protection reports. Admins can select Communication anomalies, choose a date range, and run the report to view results: Insights include external domains with unusual communication activity: External domain name Total anomalies detected New 1:1 chat threads created by that domain New group chat threads created by that domain A Block option is available directly in the report for managing external domains | Who is affected:
Teams administrators can view this report for their Microsoft 365 tenant if their organization collaborates with external organizations. What will happen: A new External domains anomalies report will be available in the Microsoft Teams admin center under Protection reports. Admins can select Communication anomalies, choose a date range, and run the report to view results: Insights include external domains with unusual communication activity: External domain name Total anomalies detected New 1:1 threads created by that domain New group threads created by that domain A Block option is available directly in the report for managing external domains |
| 2026-01-30 | MC Title | Microsoft Teams: External domains anomalies report | (Updated) Microsoft Teams: External domains anomalies report |
| 2026-01-30 | MC End Time | 04/30/2026 09:00:00 | 2026-04-20T09:00:00Z |
Last updated 3 weeks ago ago
