reportRoot: getMailboxUsageDetail

Namespace: microsoft.graph

Get details about mailbox usage.

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


One of the following permissions is required to call this API. To learn more, including how to choose permissions, see Permissions.

Permission type Permissions (from least to most privileged)
Delegated (work or school account) Reports.Read.All
Delegated (personal Microsoft account) Not supported.
Application Reports.Read.All

Note: For delegated permissions to allow apps to read service usage reports on behalf of a user, the tenant administrator must have assigned the user the appropriate Azure AD limited administrator role. For more details, see Authorization for APIs to read Microsoft 365 usage reports.

HTTP request

GET /reports/getMailboxUsageDetail(period='{period_value}')

Function parameters

In the request URL, provide the following parameter with a valid value.

Parameter Type Description
period string Specifies the length of time over which the report is aggregated. The supported values for {period_value} are: D7, D30, D90, and D180. These values follow the format Dn where n represents the number of days over which the report is aggregated. Required.

Request headers

Name Description
Authorization Bearer {token}. Required.
If-None-Match If this request header is included and the eTag provided matches the current tag on the file, a 304 Not Modified response code is returned. Optional.


If successful, this method returns a 302 Found response that redirects to a preauthenticated download URL for the report. That URL can be found in the Location header in the response.

Preauthenticated download URLs are only valid for a short period of time (a few minutes) and do not require an Authorization header.

The CSV file has the following headers for columns.

  • Report Refresh Date
  • User Principal Name
  • Display Name
  • Is Deleted
  • Deleted Date
  • Created Date
  • Last Activity Date
  • Item Count
  • Storage Used (Byte)
  • Issue Warning Quota (Byte)
  • Prohibit Send Quota (Byte)
  • Prohibit Send/Receive Quota (Byte)
  • Deleted Item Count
  • Deleted Item Size (Byte)
  • Deleted Item Quota (Byte)
  • Has Archive
  • Report Period



The following is an example of the request.



The following is an example of the response.

HTTP/1.1 302 Found
Content-Type: text/plain

Follow the 302 redirection and the CSV file that downloads will have the following schema.

HTTP/1.1 200 OK
Content-Type: application/octet-stream

Report Refresh Date,User Principal Name,Display Name,Is Deleted,Deleted Date,Created Date,Last Activity Date,Item Count,Storage Used (Byte),Issue Warning Quota (Byte),Prohibit Send Quota (Byte),Prohibit Send/Receive Quota (Byte),Deleted Item Count,Deleted Item Size (Byte),Report Period