Microsoft’s Outlook Attachment Ban: Say Goodbye to .library-ms and .search-ms in 2025!
Microsoft is upping its security game by expanding the list of blocked Outlook attachments. Starting July 2025, .library-ms and .search-ms files will be blocked to thwart phishing exploits. Microsoft’s new approach means users might miss opening these rare files but will gain a safer inbox in return!
Hot Take:
Microsoft is playing attachment whack-a-mole again! Just when you thought it was safe to open that email from Grandma, Microsoft comes in with another round of digital nunchucks, blocking .library-ms and .search-ms file types in Outlook. It’s like they’re building a fortress around our inboxes, but hey, when cybercriminals are the Big Bad Wolf, we’re all for bricks over straw.
Key Points:
- Microsoft is expanding the list of blocked attachments in Outlook Web and the new Outlook for Windows starting July 2025.
- The .library-ms and .search-ms file types will join the BlockedFileTypes list due to their use in phishing attacks.
- This move aims to prevent exploitation of vulnerabilities like CVE-2025-24054 and CVE-2022-30190.
- Most organizations won’t be affected as these file types are rarely used.
- Admins can adjust security settings if these file types are needed in an organization’s workflow.
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