Performance Issues with Outlook Client

Microsoft have resolved the Incident and have provided the below update.

We've completed the fix rollout and confirmed via internal monitoring the service has recovered. Please note, users may need to restart the Outlook client to enable the fix.

The latest update from Mircrosoft is as follows:

Title: Users experiencing Outlook connection issues and crashes

Current status: Our fix is rolling out as expected and we've confirmed that users are experiencing service restoration as the solution reaches their respective environments. We're actively monitoring this process to ensure that our fix reaches all customers as soon as possible.

Scope of impact: This issue may potentially affect any of your users attempting to use Outlook.

Estimated time to resolve: We expect this issue to be completely resolved for all affected users by July 15, 2020 at 9:30 PM UTC.

Microsoft have sent us the following message:

Title: Users experiencing Outlook connection issues and crashes

User Impact: Users may experience crashes or may be unable to access Exchange Online via Outlook.

More info: Our analysis indicates that Outlook on the web and mobile clients are unaffected. Users may be able to leverage those protocols as an alternative means to access email and service features while we remediate this problem.

Current status: Our initial review of the available data indicates that recently deployed updates are the likely source of the problem. We're performing an analysis of all recent service updates to isolate the underlying cause of the problem and to determine the most expedient means to restore service.

Scope of impact: This issue may potentially affect any of your users attempting to use Outlook.

We will update this post again once we receive further updates. Please note that the web and mobile client versions of Outlook continue to work as intended.