title	mailboxDetails resource type
description	Represents details about a mailbox, including its unique directory identifier and associated email address.
author	tiwarisakshi02
ms.date	06/11/2025
ms.localizationpriority	medium
ms.subservice	outlook
doc_type	resourcePageType

mailboxDetails resource type

Namespace: microsoft.graph

Represents details about a mailbox, including its unique directory identifier and associated email address.

Mailboxes are associated with reservable or drop-in Places objects such as desk.

Properties

Property	Type	Description
emailAddress	String	The primary SMTP address associated with the mailbox.
externalDirectoryObjectId	String	The unique identifier of the mailbox in the external directory (such as Microsoft Entra).

None.

The following JSON representation shows the resource type.

{
  "@odata.type": "#microsoft.graph.mailboxDetails",
  "emailAddress": "String",
  "externalDirectoryObjectId": "String"
}