Microsoft blames Delta for its struggle to recover from global cyber outage

Microsoft blamed Delta Air Lines on Tuesday for its dayslong struggle to recover from a global cyber outage that led it to cancel more than 6,000 flights.

A software update last month by global cybersecurity firm CrowdStrike triggered system problems for Microsoft customers, including many airlines. But disruptions subsided the next day at other major U.S. carriers while persisting at Delta.

Microsoft said its preliminary review suggested that Delta, unlike its competitors, apparently had not modernized its IT infrastructure.