Microsoft Exchange Mail Folders API

openapi: 3.1.0
info:
  title: Microsoft Exchange Exchange Online Admin Accepted Domains Mail Folders API
  description: REST-based administrative API that enables a focused set of Exchange cmdlets and parameters as POST-only endpoints. Provides access to key tasks previously available through Exchange Web Services (EWS), including organization configuration, accepted domains, mailbox properties, mailbox folder permissions, and distribution group membership. Built as a complementary REST-first surface for specific administrative tasks caused by the EWS deprecation planned for October 2026.
  version: 2.0.0
  contact:
    name: Microsoft Support
    url: https://support.microsoft.com
    email: support@microsoft.com
  license:
    name: Microsoft API License
    url: https://www.microsoft.com/en-us/legal/terms-of-use
  x-date-modified: '2026-03-04'
servers:
- url: https://outlook.office365.com/adminapi/v2.0
  description: Exchange Online Admin API v2.0 endpoint
security:
- oauth2: []
tags:
- name: Mail Folders
  description: Operations for managing mail folders
paths:
  /me/mailFolders:
    get:
      operationId: listMailFolders
      summary: Microsoft Exchange List mail folders
      description: Get all the mail folders in the signed-in user's mailbox, including any mail search folders. By default, hidden mail folders are not included. Use the includeHiddenFolders query parameter to include them.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/TopParam'
      - $ref: '#/components/parameters/SkipParam'
      - $ref: '#/components/parameters/SelectParam'
      - name: includeHiddenFolders
        in: query
        description: Include hidden mail folders in the response
        schema:
          type: string
      responses:
        '200':
          description: Successfully retrieved mail folders
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolderCollectionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createMailFolder
      summary: Microsoft Exchange Create mail folder
      description: Create a new mail folder in the root folder of the user's mailbox.
      tags:
      - Mail Folders
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MailFolder'
      responses:
        '201':
          description: Successfully created mail folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /me/mailFolders/{mailFolder-id}:
    get:
      operationId: getMailFolder
      summary: Microsoft Exchange Get mail folder
      description: Read the properties and relationships of a mail folder object.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      - $ref: '#/components/parameters/SelectParam'
      responses:
        '200':
          description: Successfully retrieved mail folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateMailFolder
      summary: Microsoft Exchange Update mail folder
      description: Update the properties of a mail folder object.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MailFolder'
      responses:
        '200':
          description: Successfully updated mail folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteMailFolder
      summary: Microsoft Exchange Delete mail folder
      description: Delete the specified mail folder. The folder is moved to the Deleted Items folder. To permanently delete a mail folder, use the permanentDelete action.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      responses:
        '204':
          description: Successfully deleted mail folder
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/mailFolders/{mailFolder-id}/messages:
    get:
      operationId: listMailFolderMessages
      summary: Microsoft Exchange List messages in mail folder
      description: Get all the messages in the specified mail folder of the signed-in user's mailbox.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      - $ref: '#/components/parameters/TopParam'
      - $ref: '#/components/parameters/SkipParam'
      - $ref: '#/components/parameters/SelectParam'
      - $ref: '#/components/parameters/FilterParam'
      - $ref: '#/components/parameters/OrderByParam'
      responses:
        '200':
          description: Successfully retrieved messages
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageCollectionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createMessageInFolder
      summary: Microsoft Exchange Create message in folder
      description: Create a new message in the specified mail folder.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Message'
      responses:
        '201':
          description: Successfully created message in folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /me/mailFolders/{mailFolder-id}/childFolders:
    get:
      operationId: listChildFolders
      summary: Microsoft Exchange List child folders
      description: Get the folder collection under the specified folder.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      - $ref: '#/components/parameters/TopParam'
      - $ref: '#/components/parameters/SkipParam'
      responses:
        '200':
          description: Successfully retrieved child folders
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolderCollectionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    post:
      operationId: createChildFolder
      summary: Microsoft Exchange Create child folder
      description: Create a new child mail folder under the specified folder.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MailFolder'
      responses:
        '201':
          description: Successfully created child folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /me/mailFolders/{mailFolder-id}/copy:
    post:
      operationId: copyMailFolder
      summary: Microsoft Exchange Copy mail folder
      description: Copy a mail folder and its contents to another mail folder.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                destinationId:
                  type: string
                  description: The ID of the destination folder or a well-known folder name
              required:
              - destinationId
      responses:
        '200':
          description: Successfully copied mail folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/mailFolders/{mailFolder-id}/move:
    post:
      operationId: moveMailFolder
      summary: Microsoft Exchange Move mail folder
      description: Move a mail folder and its contents to another mail folder.
      tags:
      - Mail Folders
      parameters:
      - $ref: '#/components/parameters/MailFolderIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                destinationId:
                  type: string
                  description: The ID of the destination folder or a well-known folder name
              required:
              - destinationId
      responses:
        '200':
          description: Successfully moved mail folder
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailFolder'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    EmailAddress:
      type: object
      description: Represents the name and email address of a contact or message recipient
      properties:
        name:
          type: string
          description: The display name of the person or entity
        address:
          type: string
          format: email
          description: The email address of the person or entity
    ODataError:
      type: object
      description: OData error response
      properties:
        error:
          type: object
          properties:
            code:
              type: string
              description: The error code
            message:
              type: string
              description: The error message
            innerError:
              type: object
              properties:
                request-id:
                  type: string
                date:
                  type: string
                  format: date-time
    InternetMessageHeader:
      type: object
      description: A key-value pair representing an Internet message header
      properties:
        name:
          type: string
          description: The name of the message header
        value:
          type: string
          description: The value of the message header
    DateTimeTimeZone:
      type: object
      description: Describes the date, time, and time zone of a point in time
      properties:
        dateTime:
          type: string
          description: A date and time combined in ISO 8601 format
        timeZone:
          type: string
          description: Represents a time zone (e.g. Pacific Standard Time)
    Message:
      type: object
      description: A message in a mailFolder
      properties:
        id:
          type: string
          readOnly: true
          description: Unique identifier for the message
        subject:
          type: string
          description: The subject of the message
        body:
          $ref: '#/components/schemas/ItemBody'
        bodyPreview:
          type: string
          readOnly: true
          description: The first 255 characters of the message body in text format
        from:
          $ref: '#/components/schemas/Recipient'
        sender:
          $ref: '#/components/schemas/Recipient'
        toRecipients:
          type: array
          items:
            $ref: '#/components/schemas/Recipient'
          description: 'The To: recipients for the message'
        ccRecipients:
          type: array
          items:
            $ref: '#/components/schemas/Recipient'
          description: 'The Cc: recipients for the message'
        bccRecipients:
          type: array
          items:
            $ref: '#/components/schemas/Recipient'
          description: 'The Bcc: recipients for the message'
        replyTo:
          type: array
          items:
            $ref: '#/components/schemas/Recipient'
          description: The email addresses to use when replying
        conversationId:
          type: string
          description: The ID of the conversation the email belongs to
        conversationIndex:
          type: string
          format: byte
          description: Indicates the position of the message within the conversation
        createdDateTime:
          type: string
          format: date-time
          readOnly: true
          description: The date and time the message was created in ISO 8601 UTC format
        lastModifiedDateTime:
          type: string
          format: date-time
          readOnly: true
          description: The date and time the message was last changed in ISO 8601 UTC format
        receivedDateTime:
          type: string
          format: date-time
          readOnly: true
          description: The date and time the message was received in ISO 8601 UTC format
        sentDateTime:
          type: string
          format: date-time
          readOnly: true
          description: The date and time the message was sent in ISO 8601 UTC format
        hasAttachments:
          type: boolean
          readOnly: true
          description: Indicates whether the message has attachments (excludes inline attachments)
        importance:
          type: string
          enum:
          - low
          - normal
          - high
          description: The importance of the message
        inferenceClassification:
          type: string
          enum:
          - focused
          - other
          description: The classification of the message for the user based on inferred relevance or importance
        internetMessageId:
          type: string
          description: The message ID in the format specified by RFC2822
        internetMessageHeaders:
          type: array
          items:
            $ref: '#/components/schemas/InternetMessageHeader'
          readOnly: true
          description: A collection of message headers defined by RFC5322
        isDeliveryReceiptRequested:
          type: boolean
          description: Indicates whether a delivery receipt is requested
        isDraft:
          type: boolean
          readOnly: true
          description: Indicates whether the message is a draft
        isRead:
          type: boolean
          description: Indicates whether the message has been read
        isReadReceiptRequested:
          type: boolean
          description: Indicates whether a read receipt is requested
        parentFolderId:
          type: string
          readOnly: true
          description: The unique identifier for the message's parent mailFolder
        webLink:
          type: string
          format: uri
          readOnly: true
          description: The URL to open the message in Outlook on the web
        flag:
          $ref: '#/components/schemas/FollowupFlag'
        categories:
          type: array
          items:
            type: string
          description: The categories associated with the message
        changeKey:
          type: string
          readOnly: true
          description: The version of the message
        uniqueBody:
          $ref: '#/components/schemas/ItemBody'
    MessageCollectionResponse:
      type: object
      description: Collection of messages
      properties:
        '@odata.context':
          type: string
        '@odata.nextLink':
          type: string
          format: uri
          description: URL to get the next set of results
        value:
          type: array
          items:
            $ref: '#/components/schemas/Message'
    MailFolderCollectionResponse:
      type: object
      description: Collection of mail folders
      properties:
        '@odata.context':
          type: string
        '@odata.nextLink':
          type: string
          format: uri
        value:
          type: array
          items:
            $ref: '#/components/schemas/MailFolder'
    MailFolder:
      type: object
      description: A mail folder in a user's mailbox
      properties:
        id:
          type: string
          readOnly: true
          description: The mail folder's unique identifier
        displayName:
          type: string
          description: The mail folder's display name
        parentFolderId:
          type: string
          readOnly: true
          description: The unique identifier for the parent mail folder
        childFolderCount:
          type: integer
          readOnly: true
          description: The number of immediate child mail folders
        totalItemCount:
          type: integer
          readOnly: true
          description: The number of items in the mail folder
        unreadItemCount:
          type: integer
          readOnly: true
          description: The number of unread items in the mail folder
        isHidden:
          type: boolean
          description: Indicates whether the mail folder is hidden
    Recipient:
      type: object
      description: Represents an email recipient
      properties:
        emailAddress:
          $ref: '#/components/schemas/EmailAddress'
    ItemBody:
      type: object
      description: Represents the body of a message or event
      properties:
        contentType:
          type: string
          enum:
          - text
          - html
          description: The type of the content
        content:
          type: string
          description: The content of the item body
    FollowupFlag:
      type: object
      description: Follow-up flag on a message
      properties:
        completedDateTime:
          $ref: '#/components/schemas/DateTimeTimeZone'
        dueDateTime:
          $ref: '#/components/schemas/DateTimeTimeZone'
        startDateTime:
          $ref: '#/components/schemas/DateTimeTimeZone'
        flagStatus:
          type: string
          enum:
          - notFlagged
          - complete
          - flagged
          description: The status of the follow-up flag
  responses:
    NotFound:
      description: Not found - the specified resource was not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
    Unauthorized:
      description: Unauthorized - authentication is required
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
    BadRequest:
      description: Bad request - the request body or parameters are invalid
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
  parameters:
    OrderByParam:
      name: $orderby
      in: query
      description: Comma-separated list of properties to sort results by
      schema:
        type: string
    MailFolderIdParam:
      name: mailFolder-id
      in: path
      required: true
      description: The unique identifier of the mail folder, or a well-known folder name such as inbox, drafts, sentitems, or deleteditems
      schema:
        type: string
    FilterParam:
      name: $filter
      in: query
      description: OData filter expression to filter results
      schema:
        type: string
    SkipParam:
      name: $skip
      in: query
      description: The number of items to skip in a result set
      schema:
        type: integer
        minimum: 0
    TopParam:
      name: $top
      in: query
      description: The number of items to return in a result set
      schema:
        type: integer
        minimum: 1
    SelectParam:
      name: $select
      in: query
      description: Comma-separated list of properties to include in the response
      schema:
        type: string
  securitySchemes:
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization with Microsoft identity platform
      flows:
        clientCredentials:
          tokenUrl: https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token
          scopes:
            https://outlook.office365.com/.default: Default scope for Exchange Online Admin API