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-April 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 February 27, 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 April 2026 (previously early March) and expected to complete in mid-April 2026 (previously mid-March).
Change Category:
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Scope:
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Release Phase:
Created:
2026-01-21
updated:
2026-02-28
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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summary for non-techies**
Microsoft Teams will introduce the External Domains Anomalies Report by mid-April 2026, allowing administrators to detect and manage unusual communication patterns with external organizations, including the ability to block suspicious domains and set up daily alerts for top anomalies.
Direct effects for Operations**
Increased Security Risks
Without preparation, the rollout of the External domains anomalies report may lead to unmonitored external communications, increasing the risk of data breaches or security incidents due to lack of awareness of unusual activities.
- roles: Teams Administrators, Security Officers
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=536572
User Experience Disruption
If the report is not properly communicated to users, Teams administrators may face confusion or delays in responding to alerts about unusual external communications, negatively impacting user trust and collaboration efficiency.
- roles: Teams Administrators, End Users
- 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 |
| 2026-02-28 | MC Last Updated | 01/30/2026 00:00:36 | 2026-02-27T18:11:33Z |
| 2026-02-28 | MC Messages | 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. | Updated February 27, 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 April 2026 (previously early March) and expected to complete in mid-April 2026 (previously mid-March). |
| 2026-02-28 | MC End Time | 04/20/2026 09:00:00 | 2026-05-18T09:00:00Z |
| 2026-02-28 | MC 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. | Microsoft Teams will roll out the External domains anomalies report by mid-April 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 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 2 weeks ago ago
