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MC1163757 Plan for changeUpdated messageFeature updateUser impactAdmin impact

Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs)

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Exchange Online
Microsoft 365 admin center

Action date

1 Nov 2025 360d ago Act by , as Microsoft's metadata states

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw
  • Seen 2 Oct 2025 early November 2025, mid-November 2025

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, safely structured
Updated October 2, 2025: This feature update has already rolled out to the Production environment — the original message was intended for a different audience. We apologize for any inconvenience. Introduction 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.  When this will happen:  This feature update has already rolled out to the Production environment. How this will affect your organization: If your organization has fewer than 3,000 DDGs, this change will not impact you. However, after your organization reaches this limit, you will not be able to create new DDGs until some existing DDGs are removed. This change will be on by default and cannot be turned off by admins. What you need to do to 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 Exchange Online limits - Service Descriptions | Microsoft Learn Compliance considerations: No compliance considerations identified, review as appropriate for your organization.

What changed

Between archive captures, newest first

  1. Updated October 2, 2025: After further review, we are not rolling This feature update has already rolled out to the Production (Worldwide).environment — the original message was intended for a different audience. We apologize for any inconvenience. Introduction We will soon introduce a new … to remove existing DDGs before creating new ones.  When this will happen:  We will communicate via Message center when we are ready to proceed.This feature update has already rolled out to the Production environment. How this will affect your organization: If your organization has fewer than …

  2. Updated October 2, 2025: We have updated the title. Thank youAfter further review, we are not rolling out to Production (Worldwide). We apologize for your patience.any inconvenience. Introduction We will soon introduce a new limit on dynamic distribution groups … to remove existing DDGs before creating new ones.  When this will happen: General Availability:  We will begin rolling out in early November 2025 and expect communicate via Message center when we are ready to complete by mid-November 2025.proceed. How this will affect your organization: If your organization has fewer than …

    • Title Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs) for Microsoft 365 operated by 21Vianet → Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs)
    • Tags Feature update, User impact, Admin impact → Updated message, Feature update, User impact, Admin impact

    Updated October 2, 2025: We have updated the title. Thank you for your patience. Introduction We will soon introduce a new limit on dynamic distribution groups …

  4. · first version seen

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