Microsoft is implementing a new policy to disable external workbook links to blocked file types in Excel, enhancing security by preventing access to high-risk files and reducing phishing risks. The change, scheduled between October 2025 and July 2026, will affect user workflows and can be managed through settings and registry edits. #Excel #FileBlockExternalLinks
Keypoints
- Microsoft will disable external links to blocked file types in Excel starting from October 2025.
- Blocked external links will trigger #BLOCKED errors or fail to refresh, increasing security.
- Users will see warning bars about this change when opening affected workbooks in Build 2509.
- Admins can re-enable external links by changing registry settings before the policy is enforced.
- This policy is part of broader efforts to disable Office features vulnerable to malware exploitation.