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Outlook | Web | Outlook on the web for business | Email
Sending, receiving, and organizing email in Outlook on the web for business
Dear Rey Fandino,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Based on your description, I understand that you have a query "unable to open attachments on outlook web."
I have checked from my end, yes this is a known issue, it is still ongoing and was posted to the Service Health Dashboard (SHD) as incident EX765364, Users may be intermittently unable to download attachments or view embedded images in Outlook on the web.
User impact: Users may be intermittently unable to download attachments or view embedded images in Outlook on the web.
More info: Users may see the following error message when an attachment fails to download: “Error downloading the file content.” Downloading attachments and embedded image viewing may succeed after signing out and then back into Outlook on the web. If available, users can download attachments and view embedded images consistently through the Outlook desktop client. We’re validating whether this problem also intermittently impacts Outlook mobile.
Current status: After further review of the reported impact scenario, we've confirmed that Outlook on the web users also may be unable to view embedded images in email messages and that both impact scenarios are intermittent occurring. We've updated the “Title”, “User impact”, and “More info” accordingly. Our internal validation process has identified some necessary adjustments to the fix which have been added and are undergoing additional testing. Once complete, we’ll review our timeline estimate for deploying the fix to all affected users.
Scope of impact: Users attempting to download attachments and viewing embedded images in Outlook on the web may be intermittently impacted.
Root cause: A recent update, intended to improve the reliability of Outlook on the web, contains a code configuration issue that's causing long running sessions, preventing attachment downloads and embedded image viewing.
For affected customers to easily identify the information here, this thread will be closed. You may subscribe to this thread or refer to SHD for updated information. I will also post back here once the issue is resolved on SHD.