MC1125497 | (Updated) External workbook links to blocked file types will be disabled by default

Service

Microsoft 365 apps

Last Updated

2025-11-25T19:38:22.357Z

Published

2025-07-30T23:50:24Z

Message ID

MC1125497

Updated November 25, 2025: This change is currently on hold. We will communicate via Message center when we are ready to proceed. We apologize for any inconvenience this may have caused and thank you for your patience. Introduction To enhance workbook security, a new group policy is being introduced to expand File Block Settings to external workbook links. This policy allows administrators to control whether links to blocked file types can be refreshed. If not configured, no changes will take effect immediately. However, starting November 2025, the default behavior will block external links to file types currently blocked by the Trust Center. When this policy is enabled, new references to bl...

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