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Microsoft plans to allow Office 365 admins to ensure that end users can’t override organization-wide policies set up to block active content even with Trusted Documents.
Trusted Documents are files that contain active content such as ActiveX controls, macros, and Dynamic Data Exchange (DDE) functions that don’t require user interaction, but still open without displaying a prompt or a warning.
However, such active content also lends itself to being misused by threat actors for malicious purposes. Until now, embedded active content in Trusted Documents enabled the files to bypass the Protected View safeguards, but
Microsoft will allow Office 365 Administrators prevent end users from overriding organization-wide policies that are set to block active content, even when using trusted documents.
A trusted document is a file that contains active content that requires no user interaction, such as ActiveX controls, macros, and Dynamic Data Exchange (DDE) functions, but can be opened without prompts or warnings.