User impact: Users’ scheduled meetings may appear one hour ahead in Exchange Online.

More info: This could affect any tenant scheduling a meeting with users within Mexico time zones.

For example, a meeting that is scheduled for 3:00 PM UTC by users but it shows up as 4:00 PM UTC within the invitee’s calendar.

Current status: The fix is 97 percent deployed, and projections support that it’ll complete and remediate impact by Saturday, April 1, 2023. 

Scope of impact: Any users’ meetings may appear to be scheduled for one hour ahead of its intended time if scheduling a meeting with users within Mexico time zones.

Start time: Wednesday, March 1, 2023, at 4:13 PM UTC

Estimated time to resolve: Current deployment projections provide that the fix will have completed deployment and remediated the impact by Saturday, April 1, 2023.

Root cause: The service infrastructure responsible for managing users’ time zone data is missing a configuration required for time zone calculation for Daylight Savings in Mexico, resulting in impact.

Next update by: Saturday, April 1, 2023, at 11:30 PM UTC