MailFolder

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "MailFolder",
  "type": "object",
  "description": "A mail folder in a user's mailbox, such as Inbox and Drafts. Mail folders can contain messages, other Outlook items, and child mail folders.",
  "properties": {
    "id": {
      "type": "string",
      "description": "The unique identifier of the mail folder. Read-only."
    },
    "displayName": {
      "type": "string",
      "description": "The mail folder's display name."
    },
    "parentFolderId": {
      "type": "string",
      "description": "The unique identifier for the parent mail folder."
    },
    "childFolderCount": {
      "type": "integer",
      "description": "The number of immediate child mail folders in the current folder."
    },
    "unreadItemCount": {
      "type": "integer",
      "description": "The number of items marked as unread in the folder."
    },
    "totalItemCount": {
      "type": "integer",
      "description": "The number of items in the folder."
    },
    "isHidden": {
      "type": "boolean",
      "description": "Indicates whether the mail folder is hidden. Can only be set when creating the folder."
    }
  }
}