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Oct 07 2026 Microsoft Outlook to block MSIX attachments starting November

Source

Microsoft announced that it will add.msix and.msixbundle attachments to the list of blocked attachments in Outlook Web and the new Outlook Windows client starting next month. [...]

Posted by Sergiu Gatlan on Wed 07 October 2026 in BleepingComputer.

Tags: Microsoft, Security.

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