Microsoft will block two Windows installer formats in Outlook from November
From early November, Outlook on the web and the new Outlook for Windows will refuse to open .msix and .msixbundle attachments, three years after Microsoft disabled the installer behind them for the same reason, and the change arrives as an edit to the default policy in every tenant
Via TNW | Business
Microsoft will add .msix and .msixbundle to Outlook’s blocked attachment list in early November, closing an email route for a packaging format its own threat researchers watched four criminal groups abuse in 2023. Renaming the extension still gets a package through, and the change lands as a default policy edit in every Exchange Online tenant, including those of European governments now trying to leave.
From early November, Outlook on the web and the new Outlook for Windows will stop users…
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