Microsoft blamed Delta Airlines for ongoing issues from a global cyber outage last month that led to over 6,000 flights cancellation the problem triggered by a crowd strike software update affected Microsoft customers but disruptions continued at Delta while easing for other airlines more in this report Microsoft blamed Delta Airlines on Tuesday for its struggle to recover from a global cyber outage last month the days long issue led the airline to cancel more than 6,000 flights a software update in July by global cyber security firm crowd strike triggered system problems for Microsoft customers including many airlines Bart disruptions eased the next day at other major US carriers while problems persisted at Delta Microsoft said its preliminary review suggested that Delta had not modernized its it infrastructure unlike its competitors Delta hit back saying it had invested billions of dollars in it capital expenditures since 2016 in addition to the billions it spends annually on operating costs last week Delta's CEO Ed Bastian branded Microsoft's platform quote the most fragile of the two the airline relies on Microsoft has refuted this statement the flight disruptions stranded hundreds of thousands of Travelers and are estimated to cost the atlanta-based airline $500 million Delta is also facing an investigation from the US Transportation Department for the disruptions it has hired a prominent litigator to seek damages from both crowd strike and Microsoft both companies rejected Delta's claim that Crow Strike should be blamed for the flight disruptions and both companies also said they had immediately offered to assist Delta during the incident Microsoft said the US Carri turned them down while Crow strike said they received no reply