Microsoft 365 services remained disrupted early Friday, November 13, as Microsoft reported only marginal improvement in efforts to restore Outlook email and other workplace tools. In an update at 6:54 a.m. UTC (1:54 a.m. Eastern), the company continued to classify the disruption as a service degradation. Microsoft had not announced a confirmed time for full recovery.
The outage began Thursday, November 12, with users experiencing problems connecting to Exchange Online mailboxes through Outlook and other applications. Microsoft’s service health dashboard identifies the Exchange Online incident as EX1550543 and the broader Microsoft 365 disruption as MO1550821. The company subsequently confirmed that customers in multiple regions could be affected, extending the disruption beyond its initial reports from the Americas.
Affected users may encounter errors accessing Outlook on the web, connecting through desktop applications or receiving email messages. Microsoft Teams features that depend on Exchange Online, including calendars and meeting scheduling, have also experienced problems, although core messaging and online meetings have remained largely functional. Other affected functions include Microsoft 365 Copilot, SharePoint integrations, administrative tools and several security services.
Microsoft’s investigation identified problems involving servers becoming unexpectedly unavailable, increasing pressure on the remaining infrastructure. Engineers attempted to redistribute traffic, restart affected servers and adjust connection-handling processes, but some restored systems became unresponsive again after receiving traffic. The company subsequently began testing additional capacity measures and configuration changes, while reporting no evidence of malicious activity causing the incident.
The disruption has also affected government operations, demonstrating consequences beyond ordinary workplace inconvenience. The Tenth Circuit notice confirmed that its clerk’s office could not send or receive emails for much of Thursday, although its electronic filing systems remained operational. Separately, the Maine court notice warned that emailed protection-order requests submitted after 12:30 p.m. Thursday might not have reached the courts.
The U.S. Patent Office also reported Outlook connectivity problems, saying its technology staff were working with Microsoft to restore normal email operations. These disruptions illustrate how failures involving a widely used cloud-service provider can interfere with government communication and time-sensitive administrative processes. The complete number of affected organizations and users has not been independently established.
For users experiencing problems, the most important distinction is that the entire Microsoft 365 platform has not necessarily stopped functioning. Some services remain available while features dependent on Exchange Online experience intermittent failures or delays. Organizations handling urgent communications may need alternative channels, including telephone contact, as recommended in an official county service advisory.
The incident comes as Microsoft continues expanding its cloud business, with its recent quarterly results showing substantial Azure revenue growth, although this outage does not establish a disruption to Azure itself. Microsoft has not provided a verified estimate of the outage’s financial impact or a definitive explanation of its underlying root cause. The next material development will be confirmation that restored services remain stable and customers can reliably access affected Microsoft 365 functions.
