Many issues with New Outlook after weekend

Question

Many issues with New Outlook after weekend

Jade Ryu-Hurst 55

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:

Powerpoint attachments opening online in powerpoint web browser version.
PDFs do not open upon double click anymore. The attachment must be saved first.
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.
New Outlook is not syncing often enough to stay up to date
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?

Eric Reeves 15 Reputation points

2026-10-26T18:31:40.4133333+00:00

We are having issues with this build as well. Multiple users are unable to open any attachments in desktop apps.

Web gui outlook and "Open in desktop app" works fine. Tried repairs on the outlook install, rebuilding "Attachments" folder, neither fixed it.
Brandon 5 Reputation points

2026-10-26T19:55:49.37+00:00

We are seeing it more and more too. You can open in browser and from there get to desktop excel, Problem doesn't exist in outlook classic or website. Only a problem with the outlook app. Full repair, app reset, and app repair did not resolve this. Clearly a problem with outlook app. Am noting now when you choose to open in excel it chooses to save to onedrive right away. That is new and likely related to the problem.
Isaac Waller 5 Reputation points

2026-10-26T20:11:50.7+00:00

I am having these issues as well. I have found that the outlook attachments folder is not syncing with the outlook app since October 22nd. I am able to open attachments without issue from the 22nd and older, anything newer does not get stored in this folder for some reason, and henceforth cannot be opened in the apps their supposed to open in. I am also seeing this issue in the web version as well. However, in outlook classic, there is no issue whatsoever when opening any attachment.
Brian Irwin 15 Reputation points

2026-10-26T20:58:25.94+00:00

We also are noticing today that NEW outlook app users are having issues with attachments sent to them and it wanting to open in onedrive and not opening excel, word, adobe apps even when that option is chosen in outlook.
Ivory 2,610 Reputation points Independent Advisor

2026-10-26T22:37:52.2766667+00:00

Hi everyone,

As many users appear to be experiencing the same issue, I recommend reporting it through the Microsoft 365 Admin Center with your admin account. This will help ensure Microsoft is aware of the problem and can investigate it further.

If multiple reports are submitted, it may also help Microsoft better assess the impact and prioritize a resolution.
Brian Irwin 15 Reputation points

2026-10-27T13:03:32.1166667+00:00

We did report a case thru the microsoft 365 admin center to Microsoft, got back usual ansswer of that's how it works (which it did not until this past weekend) and we responded back with more information.
Ben 5 Reputation points

2026-10-27T18:36:37.2933333+00:00

Not being able to open a PDF from the inbox is fucking stupid. Why the change?
Ivory 2,610 Reputation points Independent Advisor

2026-10-27T19:26:34.9866667+00:00

Thanks, Brian and everyone for your efforts and for helping bring attention to this issue.

Another way for end users to raise awareness with Microsoft is through the Outlook Feedback Portal. This channel allows you to share issues, suggestions, and feature requests directly with Microsoft's product team. The team actively reviews community feedback, and many product improvements and enhancements have originated from user-submitted feedback.

If you decide to submit feedback, please consider sharing the link to your feedback post here. This will allow other community members experiencing the same issue to review it and upvote it, helping increase visibility and draw further attention to the concern.
Jesus VERDIN 10 Reputation points

2026-10-27T20:40:11.22+00:00

Same issue here!
Gabriel Bozzola 10 Reputation points

2026-10-27T20:56:02.6466667+00:00

The problem was identified 5 hours ago on github
https://github.com/MicrosoftEdge/WebView2Feedback/issues/5782
Jesus VERDIN 10 Reputation points

2026-10-29T14:50:56.23+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:

C:\WebView2Fixed\155.0.4283.62

Create the following registry key:

HKLM\SOFTWARE\Policies\Microsoft\Edge\WebView2

Add a String Value:

Name

olk.exe

Value

C:\WebView2Fixed\155.0.4283.62

Restart New Outlook.

Verify:

New Outlook

Settings → General → About Outlook

Confirm WebView2 Version shows:
155.0.4283.62

5 answers

Your answer

Eric Reeves 15 Reputation points

2026-10-26T18:31:40.4133333+00:00

We are having issues with this build as well. Multiple users are unable to open any attachments in desktop apps.

Web gui outlook and "Open in desktop app" works fine. Tried repairs on the outlook install, rebuilding "Attachments" folder, neither fixed it.
Brandon 5 Reputation points

2026-10-26T19:55:49.37+00:00

We are seeing it more and more too. You can open in browser and from there get to desktop excel, Problem doesn't exist in outlook classic or website. Only a problem with the outlook app. Full repair, app reset, and app repair did not resolve this. Clearly a problem with outlook app. Am noting now when you choose to open in excel it chooses to save to onedrive right away. That is new and likely related to the problem.
Isaac Waller 5 Reputation points

2026-10-26T20:11:50.7+00:00

I am having these issues as well. I have found that the outlook attachments folder is not syncing with the outlook app since October 22nd. I am able to open attachments without issue from the 22nd and older, anything newer does not get stored in this folder for some reason, and henceforth cannot be opened in the apps their supposed to open in. I am also seeing this issue in the web version as well. However, in outlook classic, there is no issue whatsoever when opening any attachment.
Brian Irwin 15 Reputation points

2026-10-26T20:58:25.94+00:00

We also are noticing today that NEW outlook app users are having issues with attachments sent to them and it wanting to open in onedrive and not opening excel, word, adobe apps even when that option is chosen in outlook.
Ivory 2,610 Reputation points Independent Advisor

2026-10-26T22:37:52.2766667+00:00

Hi everyone,

As many users appear to be experiencing the same issue, I recommend reporting it through the Microsoft 365 Admin Center with your admin account. This will help ensure Microsoft is aware of the problem and can investigate it further.

If multiple reports are submitted, it may also help Microsoft better assess the impact and prioritize a resolution.
Brian Irwin 15 Reputation points

2026-10-27T13:03:32.1166667+00:00

We did report a case thru the microsoft 365 admin center to Microsoft, got back usual ansswer of that's how it works (which it did not until this past weekend) and we responded back with more information.
Ben 5 Reputation points

2026-10-27T18:36:37.2933333+00:00

Not being able to open a PDF from the inbox is fucking stupid. Why the change?
Ivory 2,610 Reputation points Independent Advisor

2026-10-27T19:26:34.9866667+00:00

Thanks, Brian and everyone for your efforts and for helping bring attention to this issue.

Another way for end users to raise awareness with Microsoft is through the Outlook Feedback Portal. This channel allows you to share issues, suggestions, and feature requests directly with Microsoft's product team. The team actively reviews community feedback, and many product improvements and enhancements have originated from user-submitted feedback.

If you decide to submit feedback, please consider sharing the link to your feedback post here. This will allow other community members experiencing the same issue to review it and upvote it, helping increase visibility and draw further attention to the concern.
Jesus VERDIN 10 Reputation points

2026-10-27T20:40:11.22+00:00

Same issue here!
Gabriel Bozzola 10 Reputation points

2026-10-27T20:56:02.6466667+00:00

The problem was identified 5 hours ago on github
https://github.com/MicrosoftEdge/WebView2Feedback/issues/5782
Jesus VERDIN 10 Reputation points

2026-10-29T14:50:56.23+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:

C:\WebView2Fixed\155.0.4283.62

Create the following registry key:

HKLM\SOFTWARE\Policies\Microsoft\Edge\WebView2

Add a String Value:

Name

olk.exe

Value

C:\WebView2Fixed\155.0.4283.62

Restart New Outlook.

Verify:

New Outlook

Settings → General → About Outlook

Confirm WebView2 Version shows:
155.0.4283.62

Answer 1

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.

Answer 2

Mike Russo 21

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).

0 comments

Answer 3

Gabriel Bozzola 10

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

Jonathan Anonuevo 5 Reputation points

2026-10-28T21:14:55.3333333+00:00

This tracks with what my users experience where the issue occurs only on WebView2 v156.x versions. v155 is not affected.
Isaac Waller 5 Reputation points

2026-10-29T14:34:52.47+00:00

My team and I have found by running the following script in PowerShell as Admin and then restarting outlook will allow you to open attachments in New Outlook without issue.

Get-ScheduledTask -TaskPath "\Microsoft\EdgeUpdate*" | Select TaskName, TaskPath

This does not change the version of webview2 you are on.

Answer 4

Jesus VERDIN 10

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
```

chbar 5 Reputation points

2026-10-29T17:55:40.02+00:00

This is very helpful as a temporary fix, but when new updates get pushed to WebView2 in the future, your users are still going to be locked to 155.0.xxxx.xx right? So now that Microsoft has released a patch for this, fixing it (announced 11 hours ago via their GitHub) through Edge Updater, I would go undo this on any user's devices you made these changes to.
Jesus VERDIN 10 Reputation points

2026-10-29T18:07:11.2666667+00:00

This is just for my personal computer, appreciate the input :D
chbar 5 Reputation points

2026-10-29T18:10:12.6766667+00:00

Of course <3 Very creative fix!

Answer 5

chbar 5

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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