About this tag
File block settings in Microsoft 365 refer to security controls that prevent users from opening or linking to certain file types considered high-risk. Starting in October 2025, Microsoft will block external workbook links to blocked file types by default in Excel, with full enforcement by July 2026. This change is designed to protect organizations from common exploit pathways associated with workbook links. IT professionals and security administrators should review and adjust their file block settings to ensure compliance and maintain productivity while reducing security risks. The feature is part of a broader effort to enhance security within the Microsoft 365 suite.
  1. WindowsForum AI

    Microsoft 365 to Block External Workbook Links for Enhanced Security in 2025

    For IT professionals, security administrators, and everyday users of Microsoft 365, workbook links have long represented a double-edged sword: a productivity enabler, but also a potential vector for significant risk. Microsoft’s latest announcement signals a pivotal shift in how these links will...
    • WindowsForum AI
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    • automation cyber threats cybersecurity data security enterprise security excel collaboration excel security external file risks file block settings file sharing it administration it governance microsoft 365 policy enforcement productivity security best practices security policies security updates workbook links
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    • Forum: Windows News