generated: '2026-06-20'
method: searched
source: >-
  https://learn.microsoft.com/en-us/graph/versioning-and-deprecation and the
  Exchange Online EWS deprecation guidance; corroborated by repo blog posts on
  basic-auth and legacy-token deprecations.
description: >-
  Versioning, deprecation, and reliability posture for the Microsoft Exchange
  API collection. Microsoft Graph uses named versions (v1.0 GA and beta);
  Exchange Web Services is on a published deprecation path for Exchange Online.
versioning:
  scheme: named-version-path
  current: v1.0
  preview: beta
  docs: https://learn.microsoft.com/en-us/graph/versioning-and-deprecation
  detail: >-
    Graph exposes /v1.0 (production, supported) and /beta (preview, may change
    without notice, not for production). The Mailbox Import/Export API in this
    collection is beta.
deprecation:
  policy_url: https://learn.microsoft.com/en-us/graph/versioning-and-deprecation
  sunset_header: false
  deprecation_header: false
  notice: >-
    Graph deprecations get a minimum 24-month notice and are announced via the
    changelog; they are not signaled with RFC 8594 Sunset/Deprecation headers.
  notable:
    - item: Exchange Web Services (EWS)
      status: deprecated
      sunset: '2026-10'
      note: EWS in Exchange Online stops functioning October 2026; migrate to Microsoft Graph.
      migrate_to: Microsoft Graph
    - item: Basic authentication (IMAP/POP/SMTP/EWS)
      status: retired
      note: Basic auth deprecated in favor of OAuth 2.0; see blogs/ in this repo.
    - item: Legacy Exchange Online tokens for Outlook add-ins
      status: deprecating
      note: See blogs/2024-08-14 legacy-token deprecation.
sla:
  url: https://www.microsoft.com/licensing/docs/view/Service-Level-Agreements-SLA-for-Online-Services
  uptime_target: "99.9%"
  note: Microsoft 365 financially-backed SLA covers Exchange Online.
status_page: https://status.office365.com/
support: https://support.microsoft.com/en-us/office
deprecated_operations: []