MEDIUMVulnerability
Global

Microsoft Outlook to block MSIX attachments starting November

·Source: BleepingComputer

Updated:

Executive Summary

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. [...]

Analysis

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. [...]
Source Attribution

Originally published by BleepingComputer on Oct 7, 2026.

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