Dynamic Distribution Group Membership Now Updates Faster in Exchange Online

Dynamic distribution groups

๐Œ๐ข๐œ๐ซ๐จ๐ฌ๐จ๐Ÿ๐ญ ๐„๐ฑ๐œ๐ก๐š๐ง๐ ๐ž ๐Ž๐ง๐ฅ๐ข๐ง๐ž ๐ข๐ฌ ๐ซ๐ž๐ฆ๐จ๐ฏ๐ข๐ง๐  ๐จ๐ง๐ž ๐จ๐Ÿ ๐ญ๐ก๐ž ๐ฆ๐จ๐ซ๐ž ๐š๐ง๐ง๐จ๐ฒ๐ข๐ง๐  ๐ฐ๐š๐ข๐ญ๐ฌ ๐š๐๐ฆ๐ข๐ง๐ฌ ๐๐ž๐š๐ฅ ๐ฐ๐ข๐ญ๐ก ๐ฐ๐ก๐ž๐ง ๐ฐ๐จ๐ซ๐ค๐ข๐ง๐  ๐ฐ๐ข๐ญ๐ก ๐ƒ๐ฒ๐ง๐š๐ฆ๐ข๐œ ๐ƒ๐ข๐ฌ๐ญ๐ซ๐ข๐›๐ฎ๐ญ๐ข๐จ๐ง ๐†๐ซ๐จ๐ฎ๐ฉ๐ฌ.

Previously, after creating a new DDG or modifying its filter, you might have had to wait up to 2 hours for membership to populate.

Thatโ€™s changing.

If the filter returns 5,000 members or fewer, membership will now populate immediately as part of the create or modify action.

For larger groups (more than 5,000 members):

โ‡ข Membership will still populate in the background within up to 2 hours
โ‡ข Admins will now see a warning in both EAC and PowerShell during creation or modification

One useful detail: if you modify a large DDG, the existing membership list will continue to work until the updated one is ready.

The regular 24-hour membership refresh cycle remains unchanged.

Rollout begins in late May 2026 and is expected to finish by early June 2026.

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