The Microsoft 365 Domains Report provides visibility into the domains configured in your Microsoft 365 tenant and the distribution of users across those domains. This helps IT teams verify domain configuration, identify user concentration, and audit whether the correct domain is set as default.
1. Report Overview
The report consists of two sections:
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Users Per Domain (Chart): A pie chart showing the percentage of users assigned to each domain.
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Domains Table: A detailed list of all domains in the tenant, their properties, and the number of users associated with each one.
2. Users Per Domain (Chart)
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Each color represents a domain registered in Microsoft 365.
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The percentage displayed indicates the proportion of users tied to that domain.
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Example:
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example.com→ 34.5% of users -
example.net→ 33.1% -
example.org→ 32.4%
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This view makes it easy to see which domains hold the majority of accounts.
3. Domains Table
The table provides technical details for each domain:
| Column | Description |
|---|---|
| Domain | The name of the registered domain (e.g., example.com). |
| Type | Shows if the domain is Managed, Federated, or Unmanaged. |
| Capabilities | Lists Microsoft 365 services enabled for the domain (e.g., Email). |
| Default | True if this domain is set as the organization’s default. |
| Initial | True if this is the tenant’s initial domain (usually onmicrosoft.com). |
| Users | Number of user accounts associated with the domain. |
4. Why This Report Matters
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Domain Verification: Ensures all required domains are properly configured in M365.
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User Distribution: Quickly identify where most accounts are assigned.
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Default Domain Check: Confirms the correct domain is set as the organization’s default.
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Audit Support: Helps detect ongoing use of the initial
onmicrosoft.comdomain.
5. Example Use Cases
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Confirm that new business domains have been added and set as default.
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Identify legacy or unused domains that may need cleanup.
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Audit user accounts to ensure proper domain alignment for email and communication services.
By using the Microsoft 365 Domains Report, administrators can maintain accurate domain configurations, improve tenant hygiene, and ensure users are correctly aligned to the right business domains.