Microsoft is investigating a widespread Exchange Online incident that is causing authentication problems, email delays, and mailbox access failures for many users. The outage, tracked as EX1464935 and later MO1465074, also affects other Microsoft 365 services including OneDrive for Business, SharePoint Online, Microsoft Teams, Microsoft Purview, and Microsoft Defender XDR. #ExchangeOnline #Microsoft365 #OneDriveforBusiness #SharePointOnline #MicrosoftTeams #MicrosoftPurview #MicrosoftDefenderXDR
Keypoints
- Microsoft is investigating a major service issue in Exchange Online.
- The outage is causing authentication errors and email delivery delays.
- Users are also facing problems searching mailboxes and accessing admin tools.
- Microsoft identified a core authentication configuration issue as the likely cause.
- The incident also impacts OneDrive for Business, SharePoint Online, Teams, Purview, and Defender XDR.