openapi: 3.1.0
info:
  title: Microsoft Exchange Microsoft Graph Mailbox Import Export API
  description: >-
    APIs for discovering, importing, and exporting content from Exchange Online
    mailboxes in full fidelity through the Microsoft Graph beta endpoint.
    Enables mailbox migration scenarios and content copying as a replacement
    for EWS-based approaches. Supports importing and exporting mailbox content
    including messages, calendar events, and contacts while preserving all
    metadata and properties.
  version: 0.1.0-beta
  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://graph.microsoft.com/beta
    description: Microsoft Graph beta endpoint (preview)
security:
  - oauth2: []
tags:
  - name: Mailbox Discovery
    description: Operations for discovering mailbox structure and content
  - name: Mailbox Export
    description: Operations for exporting content from mailboxes
  - name: Mailbox Import
    description: Operations for importing content into mailboxes
paths:
  /users/{user-id}/mailboxes:
    get:
      operationId: listMailboxes
      summary: Microsoft Exchange List mailboxes
      description: >-
        Discover the mailboxes associated with a user, including primary
        mailbox and archive mailbox information. Returns mailbox metadata
        needed for import and export operations.
      tags:
        - Mailbox Discovery
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
      responses:
        '200':
          description: Successfully retrieved mailbox information
          content:
            application/json:
              schema:
                type: object
                properties:
                  '@odata.context':
                    type: string
                  value:
                    type: array
                    items:
                      $ref: '#/components/schemas/Mailbox'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /users/{user-id}/mailboxes/{mailbox-id}/folders:
    get:
      operationId: listMailboxFolders
      summary: Microsoft Exchange List mailbox folders
      description: >-
        List all folders in the specified mailbox for content discovery.
        Returns folder hierarchy with metadata needed for targeted import
        and export operations.
      tags:
        - Mailbox Discovery
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
        - $ref: '#/components/parameters/MailboxIdParam'
        - $ref: '#/components/parameters/TopParam'
        - $ref: '#/components/parameters/SkipParam'
      responses:
        '200':
          description: Successfully retrieved mailbox folders
          content:
            application/json:
              schema:
                type: object
                properties:
                  '@odata.context':
                    type: string
                  '@odata.nextLink':
                    type: string
                    format: uri
                  value:
                    type: array
                    items:
                      $ref: '#/components/schemas/MailboxFolder'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /users/{user-id}/mailboxes/{mailbox-id}/folders/{folder-id}/items:
    get:
      operationId: listMailboxFolderItems
      summary: Microsoft Exchange List folder items
      description: >-
        List items in a specific mailbox folder for export. Returns items
        with their metadata for batch export processing. Supports pagination
        for large folders.
      tags:
        - Mailbox Export
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
        - $ref: '#/components/parameters/MailboxIdParam'
        - $ref: '#/components/parameters/FolderIdParam'
        - $ref: '#/components/parameters/TopParam'
        - $ref: '#/components/parameters/SkipParam'
        - $ref: '#/components/parameters/SelectParam'
      responses:
        '200':
          description: Successfully retrieved folder items
          content:
            application/json:
              schema:
                type: object
                properties:
                  '@odata.context':
                    type: string
                  '@odata.nextLink':
                    type: string
                    format: uri
                  value:
                    type: array
                    items:
                      $ref: '#/components/schemas/MailboxItem'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /users/{user-id}/mailboxes/{mailbox-id}/folders/{folder-id}/items/{item-id}/content:
    get:
      operationId: exportMailboxItemContent
      summary: Microsoft Exchange Export item content
      description: >-
        Export the full-fidelity content of a specific mailbox item in MIME
        format. Returns the complete item with all properties, headers, and
        attachments preserved for migration scenarios.
      tags:
        - Mailbox Export
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
        - $ref: '#/components/parameters/MailboxIdParam'
        - $ref: '#/components/parameters/FolderIdParam'
        - $ref: '#/components/parameters/ItemIdParam'
      responses:
        '200':
          description: Successfully exported item content
          content:
            message/rfc822:
              schema:
                type: string
                format: binary
                description: The MIME content of the item
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
  /users/{user-id}/mailboxes/{mailbox-id}/folders/{folder-id}/items/import:
    post:
      operationId: importMailboxItem
      summary: Microsoft Exchange Import item into folder
      description: >-
        Import a full-fidelity item into the specified mailbox folder. Accepts
        MIME content and creates the item preserving all properties and
        metadata. Used for mailbox migration and content copying scenarios.
      tags:
        - Mailbox Import
      parameters:
        - $ref: '#/components/parameters/UserIdParam'
        - $ref: '#/components/parameters/MailboxIdParam'
        - $ref: '#/components/parameters/FolderIdParam'
      requestBody:
        required: true
        content:
          message/rfc822:
            schema:
              type: string
              format: binary
              description: The MIME content of the item to import
      responses:
        '201':
          description: Successfully imported item
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailboxItem'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  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:
            Mailbox.Import: Import content into mailboxes
            Mailbox.Export: Export content from mailboxes
            MailboxFolder.Read: Read mailbox folder information
  parameters:
    UserIdParam:
      name: user-id
      in: path
      required: true
      description: The unique identifier or user principal name
      schema:
        type: string
    MailboxIdParam:
      name: mailbox-id
      in: path
      required: true
      description: The unique identifier of the mailbox
      schema:
        type: string
    FolderIdParam:
      name: folder-id
      in: path
      required: true
      description: The unique identifier of the folder
      schema:
        type: string
    ItemIdParam:
      name: item-id
      in: path
      required: true
      description: The unique identifier of the item
      schema:
        type: string
    TopParam:
      name: $top
      in: query
      description: Number of items to return
      schema:
        type: integer
        minimum: 1
    SkipParam:
      name: $skip
      in: query
      description: Number of items to skip
      schema:
        type: integer
        minimum: 0
    SelectParam:
      name: $select
      in: query
      description: Comma-separated list of properties to include
      schema:
        type: string
  schemas:
    Mailbox:
      type: object
      description: Represents a user's mailbox
      properties:
        id:
          type: string
          readOnly: true
          description: The mailbox unique identifier
        mailboxType:
          type: string
          enum:
            - primary
            - archive
          description: The type of mailbox
        displayName:
          type: string
          description: Display name of the mailbox
        primarySmtpAddress:
          type: string
          format: email
          description: The primary SMTP address of the mailbox
        totalItemCount:
          type: integer
          description: Total number of items in the mailbox
        totalItemSize:
          type: integer
          description: Total size of all items in bytes
    MailboxFolder:
      type: object
      description: A folder in a mailbox
      properties:
        id:
          type: string
          readOnly: true
          description: The folder unique identifier
        displayName:
          type: string
          description: Display name of the folder
        parentFolderId:
          type: string
          description: The ID of the parent folder
        folderType:
          type: string
          description: The type of folder (e.g. inbox, calendar, contacts)
        childFolderCount:
          type: integer
          description: Number of child folders
        totalItemCount:
          type: integer
          description: Total items in the folder
        unreadItemCount:
          type: integer
          description: Number of unread items
    MailboxItem:
      type: object
      description: An item in a mailbox folder
      properties:
        id:
          type: string
          readOnly: true
          description: The item unique identifier
        itemType:
          type: string
          enum:
            - message
            - event
            - contact
            - task
          description: The type of mailbox item
        subject:
          type: string
          description: The subject of the item
        createdDateTime:
          type: string
          format: date-time
          description: When the item was created
        lastModifiedDateTime:
          type: string
          format: date-time
          description: When the item was last modified
        size:
          type: integer
          description: Size of the item in bytes
        internetMessageId:
          type: string
          description: The Internet message ID (for messages)
        hasAttachments:
          type: boolean
          description: Whether the item has attachments
    ODataError:
      type: object
      description: OData error response
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            innerError:
              type: object
              properties:
                request-id:
                  type: string
                date:
                  type: string
                  format: date-time
  responses:
    BadRequest:
      description: Bad request
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
    Unauthorized:
      description: Unauthorized
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
    Forbidden:
      description: Forbidden
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'
    NotFound:
      description: Not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ODataError'