Microsoft Exchange Online outage causes email failures, auth issues

Microsoft is investigating a widespread service issue causing authentication issues, connection problems, email delays and failures, and various other issues for Microsoft 365 customers.

It first acknowledged this incident (tracked under EX1464935 in the admin center) at 5:30 PM UTC, when it began investigating a stream of reports from users on social media regarding multiple issues affecting Exchange Online.

However, while Exchange Online is the most impacted service, Microsoft revealed in a new incident report (MO1465074) that this outage also impacts multiple other Microsoft 365 services, including OneDrive for Business and SharePoint Online, Microsoft Teams, Microsoft Purview, and Microsoft Defender XDR.

According to outage tracking service Downdetector, tens of thousands of Outlook and Microsoft 365 users are affected and experiencing issues receiving emails via Outlook and accessing Microsoft cloud services.