{"id":18683,"date":"2026-09-24T02:01:46","date_gmt":"2026-09-23T17:01:46","guid":{"rendered":"https:\/\/m365jp.net\/?p=18683"},"modified":"2026-09-24T02:02:06","modified_gmt":"2026-09-23T17:02:06","slug":"mc1472591-updated-enhanced-security-and-access-controls-for-outlook-attachments","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-09-24-mc1472591-updated-enhanced-security-and-access-controls-for-outlook-attachments","title":{"rendered":"MC1472591 | (Updated) Enhanced security and access controls for Outlook attachments"},"content":{"rendered":"
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MC1472591 | (Updated) Enhanced security and access controls for Outlook attachments<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
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Classification<\/th>\nstayInformed<\/td>\n<\/tr>\n
Last Updated<\/th>\n09\/23\/2026 16:32:43<\/td>\n<\/tr>\n
Start Time<\/th>\n09\/15\/2026 22:59:37<\/td>\n<\/tr>\n
End Time<\/th>\n11\/23\/2026 08:00:00<\/td>\n<\/tr>\n
Message Content<\/th>\n\n

Updated September 23, 2026: We have updated the content. Thank you for your patience. <\/p>\n

[What and why:]<\/p>\n

As part of our overall security initiatives, we\u2019ve created a separate internal application configuration for Outlook attachments, therefore, all standard security and authentication flows will be handled separately. Moreover, Conditional Access policies are now enforced for Outlook attachment operations. Users who don\u2019t meet company policies won\u2019t be able to download, preview, or upload classic attachments (this includes inline images). Policies assigned to Exchange and Office cloud applications will be inherited by the attachment application by default. Continuous Access Evaluation is not included in the initial rollout but will follow up soon.<\/p>\n

[Rollout schedule:]<\/p>\n

Available now.<\/p>\n

[Impact on your organization:]<\/p>\n

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  • Your existing policies now cover attachments.<\/b> Conditional Access policies you have already scoped to Exchange and Office cloud applications will be enforced for attachment scenarios as well. No new policies need to be created.<\/li>\n
  • Users out of compliance will be blocked from attachments.<\/b> If a user’s session no longer satisfies a Conditional Access policy \u2015 for example, a non-compliant device, a blocked location, or a network change that triggers CAE re-evaluation \u2015 attachment operations will be blocked.<\/li>\n
  • These are separate follow-up changes<\/b> we expect to land in the upcoming weeks. We\u2019ll keep you updated on the readiness and rollout of these enhancements:\n
Machine Translation<\/th>\n\n

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