Microsoft Outlook not working, sending emails, or intermittently working on one or more devices are being reported.

From Microsoft: We've identified an issue and are continuing to apply the configuration changes to fix the underlying problem.

From Microsoft: We’ve confirmed that a recent configuration update successfully resolved the issue in the affected systems. We’ve now begun rolling out this fix globally to prevent further impact. We're also working on providing a timeline for full resolution and will share it as soon as we can.

From Microsoft: We've now resolved the incident. Thanks for your patience.