Legacy Outlook for Mac users may be unable to connect to their Exchange Online mailboxes

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: Following the completed deployment of our solution, our internal telemetry provides that impact has been remediated as of Monday, March 25, 2024, at approximately 3:00 PM UTC. We've received initial positive reports from affected users and are conducting a period of extended service monitoring so additional testing with affected users can be conducted to ensure that impact has been fully remediated.

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: Wednesday, March 27, 2024, at 6:30 PM UTC

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're finishing the final internal validations before the additional fix begins deployment, and anticipate deployment to begin by our next scheduled update.

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: Monday, March 25, 2024, at 7:30 PM UTC

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

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: As we continue to monitor the fix deployment, we've assessed that the deployment process is taking longer than originally anticipated. We expect the aforementioned process to be completed by our next scheduled update.

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

Estimated time to resolve: We expect the deployment process to be completed by Friday, March 22, 2024, at 10:00 PM 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: Friday, March 22, 2024, at 10:00 PM UTC

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: The fix is continuing to deploy to the affected environment. We're monitoring its progress and anticipate it may be finished saturating by our next scheduled communication update. We'll confirm its completion or reassess the estimated time for resolution at that time.

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: Friday, March 22, 2024, at 3:30 AM UTC

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: Our fix has begun its deployment to the affected environment, and we're monitoring as this progresses to determine an estimated time for full resolution.

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 contains an issue, resulting in the impact.

Next update by: Thursday, March 21, 2024, 1:00 AM UTC

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 confirmed a fix is developed and awaiting final approval before initiating the deployment to the affected environment. We will monitor the progress of the fix as it advances, to ensure a successful deployment.

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 contains an issue, resulting in the impact.

Next update by: Wednesday, March 20, 2024, at 6:00 PM UTC

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 confirmed that the issue blocking our fix deployment is resolved, and we’re initiating the process of deploying the fix to the affected environment. We’re monitoring the environment to ensure the deployment is progressing as expected and will provide an estimate for its completion 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 contains an issue, resulting in the impact.

Next update by: Wednesday, March 20, 2024, at 1:00 AM UTC

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 determined that the deployment of our fix to address this issue is halted as a result of an unrelated event. We’re reviewing the deployment process to unblock and resume the deployment as soon as possible.

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 contains an issue, resulting in the impact.

Next update by: Tuesday, March 19, 2024, at 8:30 PM UTC

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're preparing a fix for deployment, and we'll provide an estimated timeline for resolution once one becomes 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 contains an issue, resulting in the impact.

Next update by: Tuesday, March 19, 2024, at 6:30 PM UTC

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 confirmed that a recent service maintenance change has inadvertently caused impact. We're reviewing the details of the change to determine our next best remediation steps.

Scope of impact: Users on the legacy Outlook for Mac client attempting to access their Exchange Online mailboxes may be impacted.

Next update by: Monday, March 18, 2024, at 6:00 PM UTC

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're analyzing network trace logs to help us determine the root cause of impact.

Scope of impact: Users on the legacy Outlook for Mac client attempting to access their Exchange Online mailboxes may be impacted.

Next update by: Monday, March 18, 2024, at 11:00 AM UTC