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

More info: Some users see the meeting is scheduled an hour ahead of its intended time within Outlook on the web, Outlook mobile, and the Outlook desktop client.

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: We’re in the process of adapting the fix already deployed for cloud users for on-premise use while in parallel continuing the development of a script to repair the remaining affected event invites. We anticipate having a deployment timeline by the next scheduled update.

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: Monday, May 1, 2023, at 10:00 PM UTC