Worldwide Microsoft Outage Hits Toronto Hospitals as Thousands Report Email Disruptions

A massive Microsoft 365 outage disrupted email, meetings and other online services around the world on Thursday, November 12, affecting businesses, government departments and even Toronto hospitals.

In Canada alone, outage-tracking website Downdetector recorded more than 20,000 reports of Microsoft service problems.

And the disruption was serious enough for a major Toronto hospital network to declare a Code Grey.

Unity Health Toronto, which operates St. Michael's Hospital, St. Joseph's Health Centre and Providence Healthcare, announced the emergency designation Thursday after staff began experiencing difficulties sending and receiving emails.

A Code Grey is used to indicate an infrastructure failure, including disruptions to essential technology systems.

Were patients affected?

Fortunately, Unity Health confirmed that patient and resident care was not affected and that its hospitals remained open and safe.

However, the network advised anyone who needed to contact a clinic or department urgently about an upcoming appointment to call the hospital rather than rely on email.

Other organizations also experienced significant disruptions. Federal government departments reported difficulties accessing email and virtual meetings, while businesses around the world struggled with Outlook, Teams and other Microsoft services.

The problems continued into Friday morning.

Microsoft says it has made progress restoring services, but some users may still encounter delayed emails or intermittent connection problems as systems recover.

The company has not confirmed the underlying cause of the outage and says there is currently no indication that it resulted from malicious activity.

For organizations that depend on Microsoft to handle everything from appointments to everyday office work, the widespread disruption has raised fresh questions about how much essential infrastructure relies on a single technology provider.