generated: '2026-06-20'
method: searched
source: >-
  https://developer.microsoft.com/en-us/microsoft-365/dev-program and
  https://developer.microsoft.com/en-us/graph/graph-explorer
description: >-
  Microsoft does not publish "test cards"; the Exchange/Graph sandbox model is a
  free, sample-data-populated developer tenant plus a browser sandbox (Graph
  Explorer) that runs against a Microsoft-provided demo tenant with a signed-in
  sample account. All values below are published entry points, not secrets.
test_vs_live:
  model: separate tenant
  note: >-
    There is no test/live key prefix. Isolation is by tenant — you develop
    against a dedicated Microsoft 365 developer (sandbox) tenant, then point the
    same OAuth app + Graph endpoints at a production tenant.
developer_program:
  name: Microsoft 365 Developer Program
  url: https://developer.microsoft.com/en-us/microsoft-365/dev-program
  provides: >-
    A free, renewable Microsoft 365 E5 sandbox subscription that can be
    provisioned with sample users, mail, calendar, and contact data for testing
    Exchange Online / Graph apps.
graph_explorer:
  name: Graph Explorer
  url: https://developer.microsoft.com/en-us/graph/graph-explorer
  provides: >-
    A hosted, no-setup sandbox. Sign in with your own tenant, or use the
    built-in sample account/demo tenant to run real Mail, Calendar, Contacts,
    and People requests without registering an app.
  sample_queries:
    - GET https://graph.microsoft.com/v1.0/me/messages
    - GET https://graph.microsoft.com/v1.0/me/events
    - GET https://graph.microsoft.com/v1.0/me/contacts
    - GET https://graph.microsoft.com/v1.0/me/people
preview_endpoint:
  beta: https://graph.microsoft.com/beta
  note: The /beta endpoint is a preview surface (used by the Mailbox Import/Export API here); not a data sandbox — it hits real data.