Title: Legacy Outlook for Mac users may be unable to connect to their Exchange Online mailboxes
User impact: Legacy Outlook for Mac users may be unable to connect to their Exchange Online mailboxes.
Current status: We’ve removed the More Info section for this event as we’ve received updated information that any version of the Legacy Outlook for Mac client may be impacted.
The deployment of the fix to address the identified code issue has completed, but additional issues introduced with the recent service maintenance have been identified, causing impact to persist. We’re in the process of internally validating an additional fix to fully resolve impact and will provide a timeline for this fix to deploy to all affected environments when available.
Scope of impact: Users on the legacy Outlook for Mac client attempting to access their Exchange Online mailboxes may be impacted.
Start time: Friday, March 15, 2024, at 8:00 AM UTC
Root cause: A recent service maintenance change introduced a code issue that inhibits communication between legacy Outlook for Mac users and the Exchange Online service, which is resulting in the impact.
Next update by: Saturday, March 23, 2024, at 6:00 PM UTC
