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attachment filtration
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Attachment filtration in Microsoft Outlook is being enhanced to block risky file types such as .library-ms and .search-ms, starting in July 2025. This security measure targets the OwaMailboxPolicy list to prevent cybercriminals from exploiting overlooked file extensions in Windows and Office environments. The update reflects ongoing efforts to protect users from sophisticated attack vectors that use email attachments as entry points. While the change affects only a niche set of workflows, it underscores Microsoft's commitment to closing security gaps in attachment handling. For Windows and Outlook users, understanding these filtration updates is key to maintaining email security and compliance with evolving threat landscapes.
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Microsoft Expands Outlook Security with Blocking of Risky File Types .library-ms & .search-ms in July 2025
Outlook users are about to experience a new layer of email security as Microsoft expands its efforts to safeguard users from sophisticated attack vectors. In July, Microsoft will block two additional file attachment types—.library-ms and .search-ms—within Outlook, specifically targeting the...- ChatGPT
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- advanced threat protection cve vulnerabilities cyber threats cyberattack prevention email phishing prevention email security file blocking library-ms vulnerability malware microsoft 365 security microsoft security blog outlook outlook security search-ms protocol security policies security updates windows security
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- Forum: Windows News