Users may be intermittently unable to access the Microsoft Purview Portal or access their Exchange Online mailboxes

Title: Users may be intermittently unable to access the Microsoft Purview Portal or access their Exchange Online mailboxes

User impact: Users may be intermittently unable to access the Microsoft Purview Portal or access their Exchange Online mailboxes.

More info: For Microsoft Purview Portal impact, users may experience intermittent errors, time outs, and unauthorized responses when accessing the Microsoft Purview Portal. Additionally, users' Microsoft Purview policies may be delayed when propagating.

For Exchange Online impact, affected users may be intermittently unable to access Exchange Online through any of the following connection methods:

- Outlook on the web
- Outlook desktop client
- Representational State Transfer (REST) API
- Exchange ActiveSync (EAS)

Current status: We've identified an issue with the Microsoft Purview and Exchange Online service in which a recent update to code that facilitates memory allocation increase resulted in high Central Processing Unit (CPU) usage on a portion of SQL infrastructure, causing impact.
Our deployment of the fix for this issue is continuing and we're monitoring its progression while it saturates the affected infrastructure to resolve the issue.

Scope of impact: Some users may intermittently be affected by this issue when attempting to access their mailboxes from any connection method in Exchange Online or when attempting to access the Microsoft Purview Portal.

Start time: Wednesday, July 24, 2024, at 4:11 PM UTC

Root cause: A recent update to code that facilitates memory allocation increase resulted in high Central Processing Unit (CPU) usage on a portion of SQL infrastructure, causing impact.

Next update by: Thursday, July 25, 2024, at 6:30 AM UTC