[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-outlook-will-block-msix-app-package-attachments-next-month":10,"sections":38},{"siteName":4,"siteTagline":5,"publisherName":4,"contactEmail":6},"The Revision","Tech news, decoded.","editor@therevision.news",{"gaMeasurementId":8,"adsenseClientId":9},"G-ZW2MV82GYR","ca-pub-8533917693782264",{"article":11},{"id":12,"slug":13,"title":14,"dek":15,"body_md":16,"tags_json":17,"published_at":18,"created_at":19,"updated_at":20,"status":21,"review_note":22,"review_notes":23,"image_url":22,"persona_id":22,"persona_name":22,"section":24,"tags":25,"sources":30,"feedback":37,"feedback_at":22,"cost_usd":37,"total_tokens":37},10544,"outlook-will-block-msix-app-package-attachments-next-month","Outlook Will Block MSIX App Package Attachments Next Month","Starting in November, Outlook and Exchange Online will block MSIX and MSIXBUNDLE email attachments by default to curb malware.","Outlook is about to stop you from emailing app installers to yourself.\n\nMicrosoft confirmed it will add .msix and .msixbundle files to the default list of blocked attachment types in New Outlook for Windows and Outlook on the Web, as part of Exchange Online's OwaMailboxPolicy. Both are package formats used to install Windows applications, similar in function to .exe or .msi files, with .msixbundle able to bundle multiple architecture-specific versions into one file. Rollout starts in early November 2026 and should be finished by mid-November. Organizations that still need to send these files must add them to the AllowedFileTypes list before then, or users will simply be blocked from downloading or running them as attachments.\n\nMicrosoft says most organizations won't notice, since legitimate software distribution happens through the Microsoft Store, managed portals, or direct vendor downloads, not email. That's the real story here: if almost nobody uses these formats for legitimate attachments, the ones still landing in inboxes are more likely weaponized installers than overlooked business files.\n\nThis is the same playbook Microsoft has run on .py, .ps1, .cab files, and the ms-appinstaller protocol since 2023: add the format to the blocklist once attackers prove it's useful, not before.","[\"microsoft\",\"outlook\",\"email-security\",\"malware\"]","2026-10-07T16:20:00.000Z","2026-10-08T16:10:20.682Z","2026-10-08T16:10:24.400Z","published",null,[],"security",[26,27,28,29],"microsoft","outlook","email-security","malware",[31,34],{"name":32,"url":33},"TechRadar","https:\u002F\u002Fwww.techradar.com\u002Fpro\u002Fsecurity\u002Fmicrosoft-blocks-outlook-from-sending-two-more-file-types-over-security-concerns",{"name":35,"url":36},"The Next Web","https:\u002F\u002Fthenextweb.com\u002Fnews\u002Foutlook-msix-attachment-block-europe",0,{"sections":39},[40,45,48,53,58,63,68,73,78,83,88,93,98,103],{"name":41,"slug":42,"count":43,"latest_published_at":44},"AI","ai",6574,"2026-10-09T04:00:00.000Z",{"name":46,"slug":24,"count":47,"latest_published_at":44},"Security",926,{"name":49,"slug":50,"count":51,"latest_published_at":52},"Policy","policy",486,"2026-10-08T22:40:11.000Z",{"name":54,"slug":55,"count":56,"latest_published_at":57},"Deals","deals",474,"2026-10-08T22:00:00.000Z",{"name":59,"slug":60,"count":61,"latest_published_at":62},"Hardware","hardware",229,"2026-10-08T20:47:10.000Z",{"name":64,"slug":65,"count":66,"latest_published_at":67},"Science","science",190,"2026-10-08T21:23:31.000Z",{"name":69,"slug":70,"count":71,"latest_published_at":72},"Consumer Tech","consumer-tech",181,"2026-10-08T23:26:35.000Z",{"name":74,"slug":75,"count":76,"latest_published_at":77},"Startups","startups",117,"2026-10-08T16:45:00.000Z",{"name":79,"slug":80,"count":81,"latest_published_at":82},"Software","software",114,"2026-10-08T17:57:01.000Z",{"name":84,"slug":85,"count":86,"latest_published_at":87},"Dev Tools","dev-tools",105,"2026-10-07T16:59:11.000Z",{"name":89,"slug":90,"count":91,"latest_published_at":92},"General","general",66,"2026-10-09T04:46:11.000Z",{"name":94,"slug":95,"count":96,"latest_published_at":97},"Gaming","gaming",58,"2026-10-08T20:08:45.000Z",{"name":99,"slug":100,"count":101,"latest_published_at":102},"Reviews","reviews",34,"2026-10-08T14:00:22.000Z",{"name":104,"slug":105,"count":106,"latest_published_at":107},"How-To","how-to",8,"2026-10-05T09:00:00.000Z"]