check before: 2025-04-15
Product:
Exchange, Microsoft 365 admin center, Microsoft 365 Groups
Platform:
Online, US Instances, World tenant
Status:
Change type:
Admin impact, Feature update, Updated message, User impact
Links:
Details:
Summary:
Microsoft Exchange Online will introduce a new limit of 3,000 dynamic distribution groups (DDGs) per organization, starting mid-April 2025. Admins will need to remove existing DDGs before creating new ones if this limit is reached. This change is automatic and cannot be turned off.
Details:
Updated April 15, 2025: We have updated the rollout timeline below. Thank you for your patience.
We will soon introduce a new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online. Each organization will be limited to a maximum of 3,000 DDGs. After this limit is reached, admins will need to remove existing DDGs before creating new ones. Learn more: Exchange Online limits - Service Descriptions | Microsoft Learn
[When this will happen:]
General Availability (Worldwide, GCC): We will begin enforcing this limit in mid-April 2025 (previously early April).
Change Category:
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Scope:
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Release Phase:
Created:
2025-03-06
updated:
2025-04-16
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**
Starting mid-April 2025, Microsoft Exchange Online will limit organizations to 3,000 dynamic distribution groups, requiring administrators to manage existing groups carefully and potentially remove unnecessary ones.
Direct effects for Operations**
Limit on Dynamic Distribution Groups (DDGs)
Organizations will be restricted to a maximum of 3,000 DDGs, impacting the ability to create new groups without removing existing ones.
- roles: Exchange Admin, IT Manager
- references: https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report, https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits
User Communication Delays
Users may experience delays in communication if new DDGs cannot be created, affecting group email functionalities.
- roles: End User, Team Leader
- references: https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report, https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits
Increased Administrative Workload
Admins will need to review and potentially remove existing DDGs, increasing their workload and time spent on group management.
- roles: Exchange Admin, IT Support
- references: https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report, https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits
Potential for Miscommunication
If admins are not prepared for the limit, there may be miscommunication regarding group memberships and email distribution, leading to confusion.
- roles: Exchange Admin, Project Manager
- references: https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report, https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits
Impact on Group-Based Policies
Changes in DDG limits may affect group-based policies and permissions, leading to potential access issues for users.
- roles: IT Security Officer, Compliance Officer
- references: https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report, https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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change history
| Date | Property | old | new |
| 2025-04-16 | MC Messages | Updated March 10, 2025: We have updated the content. Thank you for your patience.
We will soon introduce a new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online. Each organization will be limited to a maximum of 3,000 DDGs. After this limit is reached, admins will need to remove existing DDGs before creating new ones. Learn more: Exchange Online limits - Service Descriptions | Microsoft Learn [When this will happen:] General Availability (Worldwide, GCC): We will begin enforcing this limit in early April 2025. | Updated April 15, 2025: We have updated the rollout timeline below. Thank you for your patience.
We will soon introduce a new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online. Each organization will be limited to a maximum of 3,000 DDGs. After this limit is reached, admins will need to remove existing DDGs before creating new ones. Learn more: Exchange Online limits - Service Descriptions | Microsoft Learn [When this will happen:] General Availability (Worldwide, GCC): We will begin enforcing this limit in mid-April 2025 (previously early April). |
| 2025-04-16 | MC Title | Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs) | (Updated) Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs) |
| 2025-04-16 | MC Last Updated | 03/10/2025 19:40:43 | 2025-04-15T17:07:25Z |
| 2025-04-16 | MC Summary | Microsoft Exchange Online will enforce a new limit of 3,000 dynamic distribution groups (DDGs) per organization starting in early April 2025. Admins will need to remove existing DDGs before creating new ones once this limit is reached. This change is automatic and cannot be turned off. | Microsoft Exchange Online will introduce a new limit of 3,000 dynamic distribution groups (DDGs) per organization, starting mid-April 2025. Admins will need to remove existing DDGs before creating new ones if this limit is reached. This change is automatic and cannot be turned off. |
| 2025-03-11 | MC Last Updated | 03/06/2025 00:53:08 | 2025-03-10T19:40:43Z |
| 2025-03-11 | MC Messages | We will soon introduce a new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online. Each organization will be limited to a maximum of 3,000 DDGs. After this limit is reached, admins will need to remove existing DDGs before creating new ones. Before rollout, we will update this post with new documentation.
[When this will happen:] General Availability (Worldwide, GCC): We will begin enforcing this limit in early April 2025. | Updated March 10, 2025: We have updated the content. Thank you for your patience.
We will soon introduce a new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online. Each organization will be limited to a maximum of 3,000 DDGs. After this limit is reached, admins will need to remove existing DDGs before creating new ones. Learn more: Exchange Online limits - Service Descriptions | Microsoft Learn [When this will happen:] General Availability (Worldwide, GCC): We will begin enforcing this limit in early April 2025. |
| 2025-03-11 | MC Summary | Microsoft Exchange Online will limit dynamic distribution groups (DDGs) to 3,000 per organization starting in April 2025. Admins must remove existing DDGs to create new ones if the limit is reached. This change is automatic and cannot be turned off. Review and manage DDGs using the provided report link. | Microsoft Exchange Online will enforce a new limit of 3,000 dynamic distribution groups (DDGs) per organization starting in early April 2025. Admins will need to remove existing DDGs before creating new ones once this limit is reached. This change is automatic and cannot be turned off. |
| 2025-03-11 | MC MessageTagNames | Feature update, User impact, Admin impact | Updated message, Feature update, User impact, Admin impact |
| 2025-03-11 | MC prepare | The enforcement of the DDG limit will happen automatically by the specified date with no admin action required before the rollout. You may want to notify your admins about this change and update any relevant documentation.
We recommend reviewing the usage of Dynamic Distribution Groups (DDGs) in your organization and removing any DDGs that are no longer needed. You can use the Dynamic distribution groups report in the Exchange admin center (EAC) to see the number of DDGs in your organization and insights into their usage. To access this report, go to the EAC > Reports > Mail flow > Dynamic distribution group report. Learn more: Dynamic Distribution Groups report in the new EAC in Exchange Online | Microsoft Learn https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report | The enforcement of the DDG limit will happen automatically by the specified date with no admin action required before the rollout. You may want to notify your admins about this change and update any relevant documentation.
We recommend reviewing the usage of Dynamic Distribution Groups (DDGs) in your organization and removing any DDGs that are no longer needed. You can use the Dynamic distribution groups report in the Exchange admin center (EAC) to see the number of DDGs in your organization and insights into their usage. To access this report, go to the EAC > Reports > Mail flow > Dynamic distribution group report. Learn more: Dynamic Distribution Groups report in the new EAC in Exchange Online | Microsoft Learn https://learn.microsoft.com/exchange/monitoring/mail-flow-reports/mfr-dynamic-distribution-groups-report https://learn.microsoft.com/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#dynamic-distribution-group-limits |
Last updated 2 weeks ago
