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.” We’re validating whether this problem also intermittently impacts Outlook mobile.

As a potential workaround, downloading attachments and embedded image viewing may succeed after an affected user signs-out and then signs-in again to Outlook on the web, if appropriate.

Additionally, users can download attachments and view embedded images consistently through the Outlook desktop client, if available.

Current status: We’ve completed the development of the fix and have begun our internal validation process. We expect this will complete by our next scheduled update on Monday, April 8, 2024, at 9:00 PM UTC. At this time we’ll begin deploying the fix to the affected environment to remediate impact.

Scope of impact: Users attempting to download attachments and viewing embedded images in Outlook on the web may be intermittently impacted.

Start time: Friday, March 29, 2024, at 12:00 AM UTC

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.

Next update by: Monday, April 8, 2024, at 9:00 PM UTC