Mailbox usage reports

Namespace: microsoft.graph

Important

APIs under the /beta version in Microsoft Graph are subject to change. Use of these APIs in production applications is not supported. To determine whether an API is available in v1.0, use the Version selector.

You can get information about users with a mailbox and their level of activity which is primarily based on emails sent and received. You can also see how much storage each mailbox consumes and how many mailboxes are approaching storage quotas.

Note: For details about different report views and names, see Microsoft 365 reports - Mailbox usage.

Reports

Function	CSV return type	JSON return type	Description
Get mailbox detail	Stream	Stream	Get details about mailbox usage.
Get mailbox counts	Stream	Stream	Get the total number of user mailboxes in your organization and how many are active each day of the reporting period. A mailbox is considered active if the user sent or read any email.
Get quota status mailbox counts	Stream	Stream	Get the count of user mailboxes in each quota category.
Get storage	Stream	Stream	Get the amount of storage used in your organization.