Users may intermittently be unable to access their calendars in Outlook on the web and the new Outlook desktop client.
- Status
- Service degradation
- Feature
- Outlook - poor customer experience
- Region
- Not specified (all regions)
- Started
- Jul 7, 2026, 19:33 CEST
- Duration
- 101 days 9 h
- Last update
- Oct 12, 2026, 10:34 CEST
- Next update
- Oct 19, 2026, 12:00 CEST
Current status
We’ve completed deployment of the fix to the initially affected service environment and expect this has remediated impact for users in that environment. The fix is continuing to propagate across the remaining affected environment, with this process expected to take approximately one additional week to complete. We’ll continue monitoring the deployment as it progresses to confirm that impact is fully remediated.
More info
Impacted users may receive the following error message:
“Can’t retrieve calendar events right now. Refresh the browser and try again.”
As a workaround, impacted users can access their calendar in the classic Outlook desktop client.
Scope of impact
Some users attempting to access their calendars through Outlook on the web or the new Outlook desktop client may intermittently be impacted.
Root cause
The issue is related to the calendar cache state following a refresh, where the event-loading process may continue referencing outdated calendar data after the folder information is updated.
Timeline
Every update Microsoft posted for this issue, newest first.
- Oct 12, 2026, 10:33 CEST
We’ve completed deployment of the fix to the initially affected service environment and expect this has remediated impact for users in that environment. The fix is continuing to propagate across the remaining affected environment, with this process expected to take approximately one additional week to complete. We’ll continue monitoring the deployment as it progresses to confirm that impact is fully remediated.
- Oct 12, 2026, 07:30 CEST
Our fix deployment is completing for the initially identified service environment; however, we’ve confirmed that additional environments remain impacted. While some users should experience impact resolution as the fix reaches them, we’re extending the fix deployment to the remaining affected environments, and we’ll provide an estimation for its completion once available.
- Oct 9, 2026, 19:02 CEST
Our fix deployment is completing and we're reaching out to some users to confirm the issue is no longer occurring.
- Oct 1, 2026, 16:30 CEST
We’ve identified that the issue is related to the calendar cache state following a refresh, where the event-loading process may continue referencing outdated calendar data after the folder information is updated. We’ve implemented and merged a fix to ensure the refreshed calendar data is correctly used when loading subsequent events. The fix is expected to reach affected users by October 9, 2026.
- Oct 1, 2026, 08:24 CEST
We’re continuing to review service health telemetry and HAR logs to investigate what we suspect is a caching issue that’s leading to the impact. We’re also testing potential solutions to confirm our findings and determine our next steps.
- Sep 30, 2026, 20:22 CEST
Our review of service health telemetry and the HAR logs persists as we continue to isolate the source of this issue.
- Sep 30, 2026, 19:27 CEST
We're currently reviewing telemetry and HTTP Archive format (HAR) log information as we investigate the cause of impact.
- Sep 30, 2026, 19:04 CEST
We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.
Subscribe to incidents in LEXOJ