Legacy authentication

Concept

Older sign-in protocols such as IMAP, SMTP and older Exchange ActiveSync versions that do not support multifactor authentication and can therefore be used to bypass MFA; blocking them is a common baseline Conditional Access policy.

Title graphic: Legacy authentication (Concept)

Type	Concept

Articles about Legacy authentication (1)

Azure File Sync Managed Identity
2025-11-21 · Mirko Peters
Learn how Azure File Sync managed identity replaces risky certificates and SAS tokens with stronger, more manageable authentication.

Glossary

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Maintained by Mirko Peters (Microsoft MVP) · Last updated: 2026-11-03