Some users may be unable to access shared mailboxes from Outlook on the web

Title: Some users may be unable to access shared mailboxes from Outlook on the web

User impact: Users may be unable to access shared mailboxes from Outlook on the web.

More info: Users can access their shared mailboxes from the Outlook desktop client and Outlook mobile to avoid this issue. Additionally, if users are actively reproducing the issue on Outlook on the web, as a potential workaround we recommend users sign out of the session to ensure the existing cookies are cleared, then access Outlook on the web using the direct link for the shared mailbox, and sign in again.

Current status: The deployment of the fix has been initiated and we’re monitoring as it progresses. We expect to have a remediation timeline by the next scheduled update.

Scope of impact: Some users attempting to access shared mailboxes from Outlook on the web may be impacted.

Start time: Saturday, April 13, 2024, at 5:00 AM UTC

Root cause: A recent Outlook on the web build within our service infrastructure is causing some requests to access shared mailboxes to fail unexpectedly.

Next update by: Thursday, April 18, 2024, at 11:30 PM UTC