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’ve confirmed that the deployment of the fix has exceeded 99 percent of the affected infrastructure and users will continue to see relief as the fix progresses. Additionally, we’ll continue to monitor the environment to further validate this issue has been remediated for meetings served by infrastructure that has received the fix.

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

Estimated time to resolve: We anticipate that the fix to repair the remaining affected event invites will be fully deployed by Wednesday, June 21, 2023.

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, June 21, 2023, at 10:00 PM UTC