New Delhi, Nov. 15 -- Microsoft on Saturday restored Microsoft 365 services to all customers following a multi-day disruption. The disruption, which began on November 12, affected access to Exchange Online mailboxes and email connectivity across multiple regions. The Microsoft 365 blackout, which affected Microsoft 365 services, including Outlook, Teams, and AI assistant Copilot, was one of the worst tech outages in history. Microsoft had attributed the disruption to "elevated load" on its infrastructure.

It said the stoppage affected its Outlook email service, as well as Microsoft's Teams communication platform and the company's Copilot AI assistant.

It brought governments, courts, healthcare services, businesses, airlines, and banks a...