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Outlook blocks .msix file types over security concerns
Original: Microsoft extends the Outlook naughty step with two more file types You didn't really want to be sending around .msix an
Microsoft has added .msix and .msixbundle files to the list of file types Outlook blocks from being sent as email attachments. The change targets Windows app package formats that attackers can abuse to deliver malware, adding to a long list of restricted extensions. Reactions are largely sarcastic, with users joking that few people were sending such files anyway, while security-minded observers welcome the tightening of email protections.
Why now: Microsoft quietly expanded Outlook's blocked attachment list, prompting discussion about email security and inconvenience to developers distributing Windows packages.
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