Microsoft Outage Status Update: Problem Identified Amid 451 4.3.2 Temporary Server Issue, Estimated Time Here

Microsoft 365 services including Outlook, Microsoft Defender and Microsoft Purview were impacted on Thursday, with the company issuing an update on the matter.

Outage trackers like Downdetector showed thousands of reports, with spikes in Outlook and broader Microsoft 365 complaints. This marks the second consecutive day of notable issues for Microsoft's cloud productivity suite in 2026. Microsoft Service Health Status also points out that Microsoft 365 is experiencing service degradation:

What is Microsoft 365 451 4.3.2 Temporary Server Error and how to fix it? Microsoft 365 faced outages affecting Outlook, Teams, Defender, and Purview. Users reported over 11,000 issues. The error indicates server-side problems.

Microsoft 365 is down on Thursday and the company issued a statement as thousands of users faced problems with services.

Microsoft suffered an outage early Wednesday morning, with Downdetector sharing thousands of users across the globe reporting an outage

If You don't have permission to share your calendar with a user or group in Microsoft 365, follow the solutions mentioned here to resolve the issue.