Security
Microsoft Outlook to block MSIX attachments starting November
BleepingComputer·October 7, 2026·1 min read
Microsoft will block .msix and .msixbundle attachments in Outlook Web and the new Outlook for Windows starting next month. The change adds these formats to the existing blocked attachment list, aiming to reduce malware risks. Users attempting to open such files will see a warning, and IT admins can adjust policies for their organizations.
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