Edge 156 / New Outlook: attachments cannot be opened; fix rolling out
Summary
After the Edge 156 update, New Outlook reportedly cannot open attachments. This is reported by users and media, not yet confirmed by a vendor source available to us. A fix reportedly started rolling out on 2026-10-29.
Symptoms
New Outlook shows an error that the file cannot be opened and asks for a restart. Afterwards the Open option disappears for the attachment.
Affected
- New Outlook for Windows
- Systems with the Edge 156 update (including the WebView2 component, according to press reports)
Workaround
- Save the attachment with Save As.
- Open the saved file manually.
Fix
According to media reports, a fix started rolling out on 2026-10-29. No vendor document with a version number is available to us. Verify by opening an attachment in New Outlook after Edge and WebView2 are up to date.
Recommendation
Make sure Edge and WebView2 are up to date and restart New Outlook. Until the fix arrives, tell users to use Save As. Check for a vendor statement before changing any configuration.
Reports from the community and trade media
Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.
- Microsoft breaks New Outlook attachment opening with Edge update News · theregister.com, 29 Oct 2026
- New Outlook attachments, Edge 156 WebView2 fix in 12 hours News · tech-insider.org, 29 Oct 2026
- Microsoft Confirms Edge 156 Update Broke Attachment Opening in New Outlook and Rolls Out a Fix News · gHacks, 30 Oct 2026
Sources
- gHacks: Microsoft Confirms Edge 156 Update Broke Attachment Opening in New Outlook and Rolls Out a Fix News · www.ghacks.net
- The Register: Microsoft breaks New Outlook attachment opening with Edge update News · www.theregister.com
- Tech Insider: New Outlook attachments, Edge 156 WebView2 fix in 12 hours News · tech-insider.org
Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 2 Nov 2026, 00:36.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
Affected? We can help.
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