Microsoft 365 Migration

How to Migrate Nested Exchange Groups to Microsoft 365 Groups

WPS Editor Sep 27, 2026 869 views

Question details

The user needs to understand how to migrate nested on-premises Exchange distribution groups to Microsoft 365 Groups within a hybrid server environment.

How to Migrate Nested Exchange Groups to Microsoft 365 Groups

Product: Microsoft Exchange Server / Microsoft 365
Device & OS: not provided
Scenario: Migrating on-premises shared mailboxes and nested distribution groups to the cloud in a hybrid Microsoft 365 setup.
Observed behavior: Users need to convert nested distribution groups without losing mail flow, membership, permissions, or breaking hybrid synchronization.

Before you start

Do not delete any existing on-premises groups before thoroughly reviewing your mail flow, user memberships, permissions, and hybrid synchronization settings.

Solution 1Recommended

Plan and Flatten Nested Groups for Hybrid Migration

Microsoft 365 Groups are cloud-based and do not natively support the exact same nested structures as on-premises Active Directory distribution groups. You must plan a structural flattening process.

Migrating nested on-premises distribution groups requires environment-specific planning. Because Microsoft 365 Groups are cloud-only, they handle group memberships differently than legacy on-premises setups.

To ensure a seamless transition, IT administrators must modify the group hierarchy before running the synchronization to the Microsoft 365 cloud.

Audit existing group structures

Review your on-premises Exchange distribution groups to document the current mail flow, membership lists, and nested permissions.

Flatten the nested hierarchy

Modify your group structures in your on-premises Active Directory to remove nesting where possible, as Microsoft 365 Groups do not natively support nested group memberships.

Consult hybrid specialists

For complex configurations, post your specific architecture details in the Exchange Server Management or Exchange Hybrid Management Microsoft Q&A sections for specialist guidance before syncing.

Plan and Flatten Nested Groups for Hybrid Migration

Avoid Premature Deletion: Never delete existing on-premises groups before confirming that the new Microsoft 365 Groups are fully synchronized and routing mail correctly.

Solution 2

Upgrade Eligible Groups via Exchange Admin Center

For distribution groups that have been successfully un-nested and are eligible for migration, you can upgrade them directly using the Exchange Admin Center (EAC).

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Frequently Asked Questions

Can Microsoft 365 Groups contain nested groups?

No, Microsoft 365 Groups do not natively support nested group memberships. If you are migrating from an on-premises Exchange environment, you must flatten your distribution groups before or during the migration process.

Why can't I directly sync my nested on-premises groups to the cloud?

Microsoft 365 groups are cloud-only structures designed for modern, unified collaboration across services like SharePoint and Teams. They do not replicate the legacy nested hierarchy used in on-premises Active Directory.

Where can I get specialized help for hybrid Exchange migrations?

Because hybrid environments vary greatly, it is highly recommended to post complex hybrid migration questions in the Exchange Server Management or Exchange Hybrid Management Microsoft Q&A forums where Microsoft specialists can assist you.

Migration & Recovery