Microsoft switches gears, keeps Exchange Online's CARs around until Sept 2024
Redmond rolled out CARs in 2017 to give administrators granular control over which devices can access their organization's mailboxes based on such properties as IP addresses – both IPv4 and IPv6 – authentication type, protocol, application, or resource they're trying to connect to.in January 2022 as a key part of Microsoft's larger Azure AD Zero Trust Session Management portfolio, with Redmond highlighting the tool's security enhancements and real-time enforcement.
"With CAE, we have introduced a new concept of Zero Trust authentication session management that is built on the foundation of Zero Trust principles – Verify Explicitly and Assume Breach," Alex Simons, corporate vice president of product management for Microsoft's identity and network access division, wrote at the time."With the Zero Trust approach, the authentication session lifespan now depends on session integrity rather than on a predefined duration.
Microsoft mapped out two scenarios for CAE – critical event evaluation and Conditional Access policy evaluation. With CAE, services like Exchange Online, SharePoint Online, and Teams subscribe to critical Azure AD events, which are evaluated in near real time. Events include when a user account is deleted or disabled, a user password is changed or reset, multifactor authentication is enabled for a user, an administrator revokes all refresh tokens for a user, and Azure AD Identity Protection identifies high user risk.
"This process enables the scenario where users lose access to organizational SharePoint Online files, email, calendar, or tasks, and Teams from Microsoft 365 client apps within minutes after a critical event," MicrosoftIn addition, those Microsoft services – plus MS Graph – can sync Conditional Access policies for evaluation within the service itself.
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