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 meetings scheduled an hour ahead of the 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 save the change.

Current status: We’re continuing to monitor the remainder of the deployment to ensure it reaches 100 percent completion as expected. In environments where the fix has completed, we’ve observed initial successes concerning previously affected meetings which are no longer exhibiting the issue.

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

Start time: Wednesday, April 5, 2023, at 8:55 PM UTC

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: Friday, June 23, 2023, at 10:00 PM UTC