Microsoft Exchange Messages API

openapi: 3.1.0
info:
  title: Microsoft Exchange Exchange Online Admin Accepted Domains Messages 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: Messages
  description: Operations for managing email messages
paths:
  /me/messages:
    get:
      operationId: listMessages
      summary: Microsoft Exchange List messages
      description: Get all the messages in the signed-in user's mailbox including the Deleted Items and Clutter folders. Supports OData query parameters including $filter, $orderby, $select, $top, $skip, and $expand.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/TopParam'
      - $ref: '#/components/parameters/SkipParam'
      - $ref: '#/components/parameters/SelectParam'
      - $ref: '#/components/parameters/FilterParam'
      - $ref: '#/components/parameters/OrderByParam'
      - $ref: '#/components/parameters/SearchParam'
      responses:
        '200':
          description: Successfully retrieved messages
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageCollectionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
    post:
      operationId: createDraftMessage
      summary: Microsoft Exchange Create draft message
      description: Create a draft of a new message in the signed-in user's mailbox. The draft can then be updated and sent. The message is saved in the Drafts folder by default.
      tags:
      - Messages
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Message'
      responses:
        '201':
          description: Successfully created draft message
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /me/messages/{message-id}:
    get:
      operationId: getMessage
      summary: Microsoft Exchange Get message
      description: Read properties and relationships of a message object. Supports $select query parameter to return specific properties.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      - $ref: '#/components/parameters/SelectParam'
      responses:
        '200':
          description: Successfully retrieved message
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateMessage
      summary: Microsoft Exchange Update message
      description: Update the properties of a message object. Only draft messages can have their body, subject, and other writable properties updated.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Message'
      responses:
        '200':
          description: Successfully updated message
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteMessage
      summary: Microsoft Exchange Delete message
      description: Delete a message in the specified user's mailbox, or delete a relationship of the message. The message is moved to the Deleted Items folder.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      responses:
        '204':
          description: Successfully deleted message
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/send:
    post:
      operationId: sendDraftMessage
      summary: Microsoft Exchange Send draft message
      description: Send a previously created message draft. The message is then saved in the Sent Items folder. The draft message can be a new message draft, reply draft, reply-all draft, or a forward draft.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      responses:
        '202':
          description: Message accepted for sending
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/reply:
    post:
      operationId: replyToMessage
      summary: Microsoft Exchange Reply to message
      description: Reply to the sender of a message, add a comment, and send the reply. The message is then saved in the Sent Items folder.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  $ref: '#/components/schemas/Message'
                comment:
                  type: string
                  description: A comment to include with the reply
      responses:
        '202':
          description: Reply accepted for sending
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/replyAll:
    post:
      operationId: replyAllToMessage
      summary: Microsoft Exchange Reply all to message
      description: Reply to all recipients of a message, add a comment, and send the reply. The message is then saved in the Sent Items folder.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  $ref: '#/components/schemas/Message'
                comment:
                  type: string
                  description: A comment to include with the reply
      responses:
        '202':
          description: Reply-all accepted for sending
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/forward:
    post:
      operationId: forwardMessage
      summary: Microsoft Exchange Forward message
      description: Forward a message, add a comment, and send the forwarded message. The message is then saved in the Sent Items folder.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                toRecipients:
                  type: array
                  items:
                    $ref: '#/components/schemas/Recipient'
                  description: The recipients to forward the message to
                comment:
                  type: string
                  description: A comment to include with the forwarded message
              required:
              - toRecipients
      responses:
        '202':
          description: Forward accepted for sending
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/copy:
    post:
      operationId: copyMessage
      summary: Microsoft Exchange Copy message
      description: Copy a message to a specified folder. Returns the new copy of the message in the destination folder.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      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:
        '201':
          description: Successfully copied message
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/move:
    post:
      operationId: moveMessage
      summary: Microsoft Exchange Move message
      description: Move a message to a specified folder. This creates a new copy of the message in the destination folder and removes the original message.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      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:
        '201':
          description: Successfully moved message
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/createReply:
    post:
      operationId: createReplyDraft
      summary: Microsoft Exchange Create reply draft
      description: Create a draft of a reply message. You can then update the draft and send it.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  $ref: '#/components/schemas/Message'
                comment:
                  type: string
      responses:
        '201':
          description: Successfully created reply draft
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/createReplyAll:
    post:
      operationId: createReplyAllDraft
      summary: Microsoft Exchange Create reply-all draft
      description: Create a draft of a reply-all message. You can then update the draft and send it.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  $ref: '#/components/schemas/Message'
                comment:
                  type: string
      responses:
        '201':
          description: Successfully created reply-all draft
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/messages/{message-id}/createForward:
    post:
      operationId: createForwardDraft
      summary: Microsoft Exchange Create forward draft
      description: Create a draft of a forward message. You can then update the draft to add recipients and content, and then send it.
      tags:
      - Messages
      parameters:
      - $ref: '#/components/parameters/MessageIdParam'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                toRecipients:
                  type: array
                  items:
                    $ref: '#/components/schemas/Recipient'
                message:
                  $ref: '#/components/schemas/Message'
                comment:
                  type: string
      responses:
        '201':
          description: Successfully created forward draft
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Message'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /me/sendMail:
    post:
      operationId: sendMail
      summary: Microsoft Exchange Send mail
      description: Send the message specified in the request body using either JSON or MIME format. The message is saved in the Sent Items folder by default. You can include a file attachment in the same sendMail action call.
      tags:
      - Messages
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                message:
                  $ref: '#/components/schemas/Message'
                saveToSentItems:
                  type: boolean
                  description: Indicates whether to save the message in Sent Items
                  default: true
              required:
              - message
      responses:
        '202':
          description: Message accepted for sending
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /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:
      - Messages
      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:
      - Messages
      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'
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'
    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'
    Forbidden:
      description: Forbidden - insufficient permissions
      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
    MessageIdParam:
      name: message-id
      in: path
      required: true
      description: The unique identifier of the message
      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
    SearchParam:
      name: $search
      in: query
      description: Search string to filter results
      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