[GLOBAL][Collaborative solutions] - Outlook Web incident notification

Incident Report for Web Cloud

Resolved

We are pleased to inform you that the incident affecting our Collaborative solutions offering on Outlook Web has been resolved.

Start time : 24/09/2026 22:57 UTC
End time : 25/09/2026 11:08 UTC
Root Cause : This incident was caused by a software issue.

We apologize for any inconvenience caused and appreciate your understanding.

Posted Sep 25, 2026 - 11:12 UTC

Investigating

We are currently investigating an incident affecting our Collaborative solutions offering, which is causing temporary availability issue in the Outlook Web.

Here are some supplementary details :

Start time : 24/09/2026 22:57 UTC
Impacted Service(s) : 503 errors are being observed on Outlook Web.
Customers Impact : Customers are temporarily getting 503 errors when trying to use Outlook Web.
Ongoing Actions : Our teams are investigating to determine the origin of the incident and fix it.

We will keep you updated on the progress and resolution.

We apologize for any inconvenience caused and appreciate your understanding.

Posted Sep 25, 2026 - 11:08 UTC

This incident affected: Collaborative solutions || Hosted Exchange (Mailbox Access).