Many issues with New Outlook after weekend

Jade Ryu-Hurst 55 Reputation points
2026-10-26T15:57:42.99+00:00

Microsoft Outlook Version: 1.2026.1013.100

Client Version: 20261016004.16

WebView2 Version: 156.0.4314.42

Session ID: [Moderator note: personally identifiable Information removed]

Current issues that have been noticed:

  1. Powerpoint attachments opening online in powerpoint web browser version.
  2. PDFs do not open upon double click anymore. The attachment must be saved first.
  3. When an email is forwarded as attachment, the reply all to those on that attached email is gone. You can only reply to the person who forwarded that to you. This is not an issue with Outlook Old.
  4. New Outlook is not syncing often enough to stay up to date
  5. When reading one part of a conversation in conversation view, all items in that conversation are now marked as read.

Can you assist with these issues?

Outlook | Windows | New Outlook for Windows | For business

5 answers

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  1. Gabriel Bozzola 10 Reputation points
    2026-10-27T20:58:55.6133333+00:00

    The problem was identified 5 hours ago on github
    https://github.com/MicrosoftEdge/WebView2Feedback/issues/5782

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    5 people found this answer helpful.
  2. Jesus VERDIN 10 Reputation points
    2026-10-29T14:52:26.85+00:00

    Workaround that works for me! Hallelujah! https://www.catalog.update.microsoft.com/Search.aspx?q=webview2 Download Microsoft.WebView2.FixedVersionRuntime.155.0.4283.62.x64.

    Extract it to a folder such as:

    YAML

    C:\WebView2Fixed\155.0.4283.62

    Create the following registry key:

    YAML

    HKLM\SOFTWARE\Policies\Microsoft\Edge\WebView2

    Add a String Value:

    Name

    olk.exe

    Value

    YAML

    C:\WebView2Fixed\155.0.4283.62

    Restart New Outlook.

    Verify:

    • New Outlook
      • Settings → General → About Outlook
        • Confirm WebView2 Version shows:
                  155.0.4283.62

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    2 people found this answer helpful.
  3. Mike Russo 21 Reputation points
    2026-10-27T13:47:46.61+00:00

    I have a computer that doesn't normally launch new Outlook that is still on September's build (1.2026.818.100) and attachment functionality works fine there. Despite repeated attempts to open and close it, it will not offer the October update, so I think Microsoft has pulled it. (I don't see it in "winget upgrade" either).

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    2 people found this answer helpful.
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  4. Ivory 2,610 Reputation points Independent Advisor
    2026-10-26T16:39:47.49+00:00

    Hi Jade,

    The AI answer covers some basic verification steps to confirm that your settings and configuration have not been changed unexpectedly. If the issue persists after reviewing these items, the most effective next step is reaching out to your IT admin and ask them to use their admin credentials to submit a support request through the Microsoft 365 Admin Center for further investigation.

    The issues reported involve several different Outlook features, including attachment handling, synchronization behavior, conversation view, and message reply functionality. A support engineer will be able to collect diagnostic logs, review the current configuration, and determine whether these behaviors are expected in New Outlook or require additional investigation.

    When submitting the ticket, please include:

    • The Outlook version information provided below
    • A description of each issue
    • Screenshots or screen recordings, if available
    • The number of affected users
    • The approximate date when the issues were first noticed

    In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support 

    I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.  

    Thank you for your effort and contributions to the forum. 

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    2 people found this answer helpful.
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  5. chbar 5 Reputation points
    2026-10-29T17:59:14.2833333+00:00

    An update via Edge Updater, fixing this issue, was announced a few hours ago. https://github.com/MicrosoftEdge/WebView2Feedback/issues/5782#issuecomment-6489635729

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