User impact: Users may see some meetings scheduled in Mexico time zones are displaying with the incorrect time.

More info: Users may also experience the problem in the Microsoft Teams calendar as it leverages the Exchange Online service.

Some users see the meeting is scheduled an hour ahead of its intended time within Outlook on the web, Outlook mobile, the Outlook desktop client, and all Microsoft Teams connection methods when accessing the calendar.

Please confirm that users’ devices are fully patched and up-to-date. For on-premises organizations, please also confirm your servers are fully patched and up-to-date.

For an immediate fix for reoccurring meetings created on or before April 1, 2023, that also had an instance of this meeting modified after this date, meeting organizers can make any small update, such as editing the subject or body, and saving the change.

Current status: After confirming that newly created meeting invites by cloud users are now showing the correct time, we’re continuing to adapt the fix to remediate the problem for on-premises users. In parallel, our script to repair the remaining affected event invites is progressing through our internal validation and testing processes and we plan to provide an updated timeline for the fix deployment once these validations have completed.

Scope of impact: This issue could affect any attendee with meetings scheduled by some users in the Mexico region.

Root cause: A code conflict during meeting creation and updating is causing time zone data to be handled incorrectly for some meetings.

Next update by: Wednesday, May 3, 2023, at 10:00 PM UTC