Microsoft attributed the outage to a network capacity upgrade issue, confirming that the disruption was unrelated to cyberattacks or AI agents.
Microsoft announced that it brought Microsoft 365 services back online following a worldwide disruption that affected Outlook, Teams, and other tools for over 24 hours, while emphasizing once more that a cyberattack was not to blame.
On Saturday, the organization stated that it had delivered service recovery to the remaining affected users and territories, pointing clients toward incident MO1550821 within the Microsoft 365 admin center.
On Friday, Microsoft explained that the service interruption originated from a complication triggered during a previous network capacity enhancement that surfaced following a recent infrastructure modification. The firm noted that this was strictly a technical problem unrelated to cyber threats or artificial intelligence agents.
The corporation stated that it resolved the root cause and brought services back online step by step, verifying system stability before moving forward with subsequent phases. Microsoft expressed regret for the inconvenience and promised to release a comprehensive post-incident review once its internal investigation concludes.
The disruption started on Thursday, blocking access to Exchange Online mailboxes as well as capabilities tied to Outlook, Teams, and Microsoft Copilot. Public sector organizations across Japan, Singapore, and the United States encountered messaging difficulties, while integrations connecting Microsoft 365 with artificial intelligence assistants suffered interruptions as well.
OpenAI reported that the Microsoft 365 integration inside ChatGPT function returned to regular operations, whereas Anthropic likewise indicated that its Microsoft 365 connector and Claude for Outlook issues were fully resolved.
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Originally published at https://cointelegraph.com/news/microsoft-365-outage-resolved-cyberattack-ruled-out?utm_source=rss_feed&utm_medium=rss&utm_campaign=rss_partner_inbound.
