Microsoft Office 365 Email Outage

Final update

Microsoft's investigation has found that a process on the affected servers responsible for establishing secure connections becomes overwhelmed, causing the servers to stop processing requests. Microsoft is preparing a configuration change to address this behavior that can be applied across all affected servers, and they're validating it on a subset of servers before applying it more broadly alongside restarts of the affected infrastructure. In parallel, Microsoft begun reverting a recent network configuration change that correlates with the start of impact and are monitoring to determine whether this contributes to recovery. The temporary traffic limitations Microsoft previously described at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect are now in effect in specific locations. They are monitoring the affected servers in those locations to confirm whether they remain stable while handling a narrower set of connections, after which they'll gradually reintroduce additional traffic. For more up to date information from Microsoft see https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect

1. Identified · Nov 13, 02:04 UTC
   Microsoft's investigation has found that a process on the affected servers responsible for establishing secure connections becomes overwhelmed, causing the servers to stop processing requests. Microsoft is preparing a configuration change to address this behavior that can be applied across all affected servers, and they're validating it on a subset of servers before applying it more broadly alongside restarts of the affected infrastructure. In parallel, Microsoft begun reverting a recent network configuration change that correlates with the start of impact and are monitoring to determine whether this contributes to recovery. The temporary traffic limitations Microsoft previously described at https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect are now in effect in specific locations. They are monitoring the affected servers in those locations to confirm whether they remain stable while handling a narrower set of connections, after which they'll gradually reintroduce additional traffic. For more up to date information from Microsoft see https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect
2. Identified · Nov 12, 20:18 UTC
   Microsoft is continuing to work on a fix for this issue.
3. Identified · Nov 12, 18:53 UTC
   Microsoft has identified this issue as impacting Office 365 globally. Updates are being provided by Microsoft via their status page: https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect . Our phone representatives do not have additional information on this issue and we are unable to take phone calls at this time. Thank you for your patience.
4. Investigating · Nov 12, 18:17 UTC
   We are currently investigating an issue affecting the ability to setup new accounts or log in to Microsoft Office 365 webmail and email applications in all regions.