News summary · Threat Intelligence

Microsoft Outlook to block MSIX attachments starting November

Reported by BleepingComputer (Sergiu Gatlan)

Summary by Cyber Security News7 Oct 2026, 17:44 CET

About this summary. This is a short excerpt from the description that BleepingComputer published with its article. Cyber Security News did not report or verify the underlying story. Read the original: https://www.bleepingcomputer.com/news/microsoft/microsoft-outlook-to-block-msix-attachments-used-in-attacks/

Microsoft Outlook to block MSIX attachments starting November — Image: BleepingComputer

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.

Read the full article at BleepingComputer →

Source attribution: headline and facts are from BleepingComputer (bleepingcomputer.com). Summary method: excerpt of the source description. See our source attribution policy.