Cloud / hosting API

Exchange Online Basic authentication

Removed legacy authentication path replaced by Modern authentication.

StatusRemoved / replaced

Still usableNo

Action requiredRotate auth

Production riskCritical

Current state

Disabled in all tenants

Microsoft states that Basic authentication is now disabled in all tenants for the affected Exchange Online protocols. The disablement was phased; October 1, 2022 is recorded as the principal rollout boundary rather than as an invented universal completion date.

Provider: Microsoft
Replacement: Modern authentication (OAuth 2.0)
Last checked: 2026-08-20

Evidence

Official source

Microsoft Learn deprecation article