Outlook Image Caching Problems

Question

Outlook Image Caching Problems

Aykut Yilmaz 0

Hi,

I am using html signature which includes <img src:url> tags.

When i replace image with another image in the server (url and name not changed), the image is changing in Outlook in Web Browser, but not in New Outlook.

Is it possible to fix this? New Outlook is caching the image forever.

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2 answers

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Answer 1

In New Outlook, if the images in your HTML signature are not updating after being replaced on the server, it is likely due to caching issues. To resolve this, you can clear the Office cache, which may help in refreshing the images. Here’s how you can do it:

Close the Outlook client if it's open.
From a command line, run the following:
```
   olk.exe --devtools
```
This opens the New Outlook on Windows client along with Microsoft Edge DevTools.
In the Microsoft Edge DevTools window, select the Network tab.
Right-click anywhere in the Requests table and select Clear browser cache.

This process should help in clearing the cached images and allow the new images to display correctly in New Outlook.

If you continue to experience issues, ensure that the image URL is accessible and that there are no other caching mechanisms in place (like server-side caching) that might be affecting the image display.

References:

Clear the Office cache

Answer 2

Henry-N 12,155 Microsoft External Staff Moderator

Hi @Aykut Yilmaz,

Thank you for posting your question in the Microsoft Q&A forum.

Regarding that the image in your email signature updates correctly in Outlook on the web, but the New Outlook for desktop hasn’t refreshed the image yet. I’d like to ask a few quick questions to better understand the situation and assist you more

Does this issue affect other users in your organization as well?
Have you already tried any troubleshooting steps?
Could you provide me the New Outlook version ?

Go to setting > General > About Outlook. You will be able to see the Outlook version
User's image In the meantime, please try the following steps to reset the New Outlook:

Right click the Windows Start button and go to Installed apps.
Locate Outlook in the list
Click the three dots next to it and select Advanced options.
From there, choose Repair to fix the app.

Thank you again for your time and understanding. While my initial response may not resolve the issue immediately, I’d like to gather more details about your situation so I can assist you more effectively.

I really appreciate your patience, and I’m here to help. Looking forward to your response!

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Aykut Yilmaz 0 Reputation points

2026-02-17T08:27:41.2666667+00:00

Hi,

Microsoft Outlook Version: 1.2026.203.300

Client Version: [Moderator note: personal info removed]

WebView2 Version: 144.0.3719.115 (Stable)

Session ID: [Moderator note: personal info removed]

Repair did not work.

Reset worked but Users won't reset their app all the time. Or sign out/in works too but they won't do that, not user friendly.

Thanks
Henry-N 12,155 Reputation points Microsoft External Staff Moderator

2026-02-18T06:57:56.4566667+00:00

Hi @Aykut Yilmaz,

Thank you for the update.

To help us determine whether the issue is related to the specific device or if it occurs more broadly, could you please test updating the signature image on another device using the New Outlook application and check whether the same behavior occurs?

Your findings will help us better isolate the cause of the caching issue.

Thank you again for your time and understanding. Please let me know the results when you have a moment.
Henry-N 12,155 Reputation points Microsoft External Staff Moderator

2026-02-20T07:46:27.97+00:00

Hi @Aykut Yilmaz,
I hope you're doing well. I just wanted to follow up and see if you’ve had a chance to review my previous reply. If possible, it would be incredibly helpful if you could share a bit more detailed update of the issue. Thank you so much for your cooperation we truly appreciate your time and effort. Looking forward to hearing from you soon.
Aykut Yilmaz 0 Reputation points

2026-02-20T08:28:33.9566667+00:00

Hi Henry,

First of all, thank you for your support.

I’m replacing an image on the server while keeping the same file name and URL. The issue is related to browser caching — once the cache is cleared, the correct image is displayed. I’ve found a way to clear the browser image cache via Intune, so that part is now resolved.

Classic Outlook works as expected. When I replace the image on the server, the updated image appears immediately in the email signature.

However, with New Outlook, the behavior is different. Once the signature is added to an email for the first time (even without sending it), the image gets cached locally. If the image is later replaced on the server, the old version continues to appear on that PC.

The same behavior occurs on other devices:

The first time the signature is added, the correct image is displayed.

After the image is replaced on the server, the old image remains visible because it is cached locally.

Running the following command resolves the issue:

Windows + R %LOCALAPPDATA%\Packages\Microsoft.OutlookForWindows_8wekyb3d8bbwe

Deleting the contents of this folder fixes the problem, which effectively does the same as performing a reset.

In short: Reset = Cleaning user cache = Resolving the caching issue. New Outlook is caching the image (<img src="url"/>) locally.

Best regards,
Aykut
Henry-N 12,155 Reputation points Microsoft External Staff Moderator

2026-02-20T16:35:38.9366667+00:00

Hi @Aykut Yilmaz,

Thank you very much for the detailed follow‑up and for the time and effort you put into investigating this behavior. Your thorough testing and the information you shared are extremely helpful.

This information greatly helps in isolating the cause, and it clearly points to local caching behavior in New Outlook as the root of the issue.

If the answer is helpful, click "Accept Answer" and politely vote yes. As other users will also search information in this community, your valuable vote will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.

Take care, and have a great day ahead!

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Outlook Image Caching Problems

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