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As part of our ongoing efforts to enhance security in Outlook Web and the New Outlook for Windows, we’re updating the default list of blocked file types in OwaMailboxPolicy. Starting in early July 2025, the following file types will be added to the BlockedFileTypes list:

.library-ms
.search-ms

Expert Analysis & Resources

Deep-dive articles and expert insights about Microsoft 365 updates by Cengiz YILMAZ (Microsoft MVP)

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