Microsoft Exchange Online: New limit for dynamic distribution groups (DDGs) [MC1024399]

Message ID: MC1024399

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.

[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

Source: Microsoft

Mike Rosoft

6 March 2025, 5:24 am

The recent announcement regarding the new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online is sure to stir the pot for both admins and users alike. With a cap of 3,000 DDGs per organization set to take effect in early April 2025, it’s time to buckle up and prepare for a bit of a shake-up.

For admins, this change may initially feel like a double-edged sword. On one hand, it could streamline group management and encourage better practices around organization and efficiency. On the other, it might require a bit of a cleanup operation, as existing DDGs will need to be pruned to make way for new ones once the limit is reached. So, if you’ve been hoarding those DDGs like they’re rare collectibles, it might be time to evaluate what’s truly necessary. A little spring cleaning never hurt anyone!

As for users, the impact should be minimal if your organization has been playing by the rules and keeping DDG numbers in check. However, if you’re part of a larger organization that frequently creates new groups, you might find yourself in a bit of a pickle when the limit is hit. It’s a good time to start advocating for any groups that are truly essential to your workflow—after all, nobody wants to be left out in the cold when it comes to communication.

Overall, while this update may seem like a minor tweak, its implications could be quite significant depending on how organizations currently utilize DDGs. It encourages a proactive approach to group management, which can ultimately lead to a more efficient use of resources.

What do you think about this change? Will it make your life easier or add another layer of complexity to your admin duties? Let’s hear your thoughts and experiences! And for more insights, don’t forget to check out additional posts on mwpro.co.uk. Your comments could spark a lively discussion!

1 Comment

Mike Rosoft


6 March 2025, 5:24 am

The recent announcement regarding the new limit on dynamic distribution groups (DDGs) in Microsoft Exchange Online is sure to stir the pot for both admins and users alike. With a cap of 3,000 DDGs per organization set to take effect in early April 2025, it’s time to buckle up and prepare for a bit of a shake-up.

For admins, this change may initially feel like a double-edged sword. On one hand, it could streamline group management and encourage better practices around organization and efficiency. On the other, it might require a bit of a cleanup operation, as existing DDGs will need to be pruned to make way for new ones once the limit is reached. So, if you’ve been hoarding those DDGs like they’re rare collectibles, it might be time to evaluate what’s truly necessary. A little spring cleaning never hurt anyone!

As for users, the impact should be minimal if your organization has been playing by the rules and keeping DDG numbers in check. However, if you’re part of a larger organization that frequently creates new groups, you might find yourself in a bit of a pickle when the limit is hit. It’s a good time to start advocating for any groups that are truly essential to your workflow—after all, nobody wants to be left out in the cold when it comes to communication.

Overall, while this update may seem like a minor tweak, its implications could be quite significant depending on how organizations currently utilize DDGs. It encourages a proactive approach to group management, which can ultimately lead to a more efficient use of resources.

What do you think about this change? Will it make your life easier or add another layer of complexity to your admin duties? Let’s hear your thoughts and experiences! And for more insights, don’t forget to check out additional posts on mwpro.co.uk. Your comments could spark a lively discussion!

1 Comment

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