Huan Qiu Wang·2025-09-27 02:32Core Viewpoint - Microsoft has acknowledged a vulnerability in the classic Outlook desktop client that affects users attempting to open OMEv2 encrypted emails from external organizations, causing operational failures and error messages related to information rights management [1][4] Group 1: Vulnerability Details - The vulnerability leads to issues in cross-organization email communication, specifically when users try to access encrypted emails from other tenants [1] - Users encounter an error message stating "Configuring computer for information rights management" when attempting to open these emails [1] Group 2: Microsoft's Response - Microsoft is actively investigating the root cause of the vulnerability and is working on a comprehensive fix [4] - A temporary workaround has been introduced, which involves adjusting Microsoft Entra's cross-tenant access policies to optimize permission verification mechanisms for decrypting encrypted emails [4] Group 3: Implementation of Temporary Solution - The simplest method for users to implement the temporary solution is to enable the "Trust multi-factor authentication (MFA) from Microsoft Entra tenants" option [4] - Administrators must log into the Microsoft Entra management center and navigate to the "Inbound Access Settings" page to configure this option [4] - Both the sending and receiving organizations must enable the trust feature for external tenant MFA for the encrypted email communication to function properly [4]