Why can't I open attachments in the new version of Outlook?

Just an update for all of you. Microsoft has finally acknowledged that there is an issue. They posted it on the Service Heath Dashboard on the o365 Admin Portal.

My workspace has the same issue. It stated to happen from the recent update.

So far...

Tried delete/recreating the Attachment folder, then the entire olk folder (got it back after repairing the app)

Tried unchecking Read only attribute on the folder.

Tried bypass all the Antivirus features.

Tried uninstalling and reinstalling the New Outlook app from the Store.

Tried setting New Outlook as the default app.

None of them worked. I feel like Microsoft might need to fix this bug.

Hello,

I also had the problem and digged in a bit deeper using sysinternals Process Monitor to see what exactly fails, when the system tries to download the file in the temporary outlook folder. There I figured out that my problem was a somehow missing Attachments folder!

Please press WIN-R and type %userprofile%\appdata\local\microsoft\olk and press Enter.
Then an explorer windows opens. Check if you can see an Attachments folder. If not create one and problem might be solved for you.

Thanks so much... this problem has been annoying me for months and Microsoft haven't been any help at all. Followed your instructions and the issue is resolved.

Hi Wyatt Boboltz,

Good day.

Thank you for posting to the Microsoft Community. We are glad to assist.

It sounds frustrating to encounter this issue. The error message you’re seeing is a known problem in the new version of Outlook. Here are a few steps you can try to resolve it:

Clear Temporary Files: Sometimes, Outlook saves attachments to a temporary folder, which can become full or corrupted. Clearing these files might help.

Update Outlook: Ensure that your Outlook is up to date. Sometimes, updates contain fixes for known issues.

Reconfigure Account: Try reconfiguring your email account in the new Outlook. This can sometimes resolve configuration issues12.

If these steps don’t work, you might want to switch back to the classic version of Outlook temporarily or use Outlook on the web, where attachments should open without issues.

If you’re still having trouble, you can try contacting Get support - Microsoft 365 admin | Microsoft Learn the support team will have access to assist remotely and collect logs to investigate the issue from the back end.

I hope this helps let me know if this is contrary to what you need, I would still be helpful to answer more of your questions .

Best Regards

Community Moderator