Microsoft 365 Alert – Service Degradation – Exchange Online – Some users’ new meetings created on the Outlook desktop client may automatically include Microsoft Teams meetings – FALSE POSITIVE

19/07/2023 08:45:00 AM (GMT)

NHSmail Reference : INC37091723

Microsoft Reference : EX649338

Issue Status : FALSE POSITIVE

Issue Description : Users’ new meetings created on the Outlook desktop client may automatically include Microsoft Teams meetings.

More info : Impact occurs despite users unchecking “Add online meeting to all meetings” in Outlook calendar settings.

This issue only affects those who are on an older version of Outlook. The following delineate which versions are impacted, depending on which release option your users are on:

For Monthly / Monthly Enterprise Channel (MEC) builds: On versions older than 16.0.14701.20124.

For First Release for Deferred Channel (FRDC) / Semi-Annual Channel (SAC) builds: On versions older than 16.0.15513.10000.

Final Update : 20/07/2023 08:51:00 AM – The investigation is complete and Microsoft have determined the service is healthy. A service incident did not actually occur.

Scope of impact : Users who are on the build versions older than the ones listed in the More info section, leveraging the Microsoft Teams meeting add-in for the Outlook desktop client, and attempting to create new meetings in the Outlook desktop client may be affected.

Root cause : Some recent changes intended to optimize the Microsoft Teams meeting add-in for the Outlook desktop client interacted negatively with the code path leveraged in specific older Outlook desktop versions, subsequently resulting in impact.