LONDON — Microsoft said on Friday that a software patch had improved server stability as it worked to restore Outlook, Teams and other Microsoft 365 services after a global outage that lasted more than 12 hours.
The company had reported only limited progress earlier on Friday. In a subsequent update, it said the patch had stabilised some servers and that it was working to apply it more widely. Microsoft said it had found no indication of a cyberattack.
The disruption began on Thursday, when Microsoft reported problems accessing Exchange Online mailboxes in the Americas. Some Outlook users struggled to send or receive email, while others could not open their inboxes. Users also reported problems with Teams and Microsoft’s Copilot AI assistant.
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City governments across the United States reported widespread email disruptions, while bankers at Morgan Stanley and Goldman Sachs in Hong Kong told CNN the outage had interrupted their work. In Britain, a London health trust asked patients to call their usual service because emails might go unread.
