Delta Airways planes are noticed parked at Seattle-Tacoma Global Airport on June 19, 2024 in Seattle, Washington. Kent Nishimura | Getty ImagesMicrosoft fired again at Delta Air Traces on Tuesday after the service stated it could search damages from the tool large and CrowdStrike for 1000’s of flight cancellations within the wake of an enormous IT outage.Delta struggled greater than rival airways to get better from the outage, canceling greater than 5,000 flights within the days following the July 19 incident, which was once sparked by means of a botched tool replace from CrowdStrike and affected thousands and thousands of computer systems working Microsoft Home windows. It value the service some $500 million, CEO Ed Bastian instructed CNBC’s “Squawk Field” final week, including the airline, which prides itself on punctuality and positions itself as a top rate airline, had “no selection” however to pursue criminal motion in opposition to the 2 era corporations.Mark Cheffo, a Dechert spouse representing Microsoft, despatched a letter Tuesday to lawyer David Boies of Boies Schiller Flexner. Boies represents Delta and had despatched letters on behalf of the airline to CrowdStrike and Microsoft.”Now we have reason why to consider Microsoft has didn’t conform to contractual necessities and differently acted in a grossly negligent, certainly willful, means in reference to the Inaccurate Replace” from CrowdStrike that brought about Home windows computer systems to crash, Boies instructed Microsoft’s leader criminal officer, Hossein Nowbar, in a letter dated July 29.Cheffo wrote in his reaction that Microsoft empathizes with Delta and its shoppers at the have an effect on of the CrowdStrike incident. “However your letter and Delta’s public feedback are incomplete, false, deceptive, and harmful to Microsoft and its popularity,” he stated.The reaction is very similar to CrowdStrike’s letter on Sunday rejecting claims from the Atlanta-based airline. Cheffo wrote that Microsoft presented to lend a hand Delta totally free. On a daily basis from July 19 to July 23, Microsoft staff stated they might lend a hand, however Delta became them away, in keeping with the letter.Microsoft CEO Satya Nadella emailed Bastian, “who hasn’t ever answered,” Cheffo wrote. CrowdStrike additionally stated its CEO George Kurtz had reached out to his counterpart at Delta “however gained no reaction.”Cheffo described a letter on July 22, from Microsoft to a Delta worker, providing lend a hand. The Delta worker wrote again: “All just right. Cool will permit you to know and thanks.”Delta executives stated the outage, which ended in extra cancellations than in all of 2019, crushed its crew-scheduling platform that fits crews to flights. However Cheffo stated Delta does not depend on Home windows or Microsoft’s Azure cloud services and products.In 2021, IBM introduced a multiyear handle Delta to lend a hand it enforce a hybrid-cloud structure working on Pink Hat’s OpenShift tool. In 2022, Amazon stated Delta had picked the virtual trade corporate’s Amazon Internet Products and services unit to be its most well-liked cloud supplier.”It’s abruptly changing into obvious that Delta most likely refused Microsoft’s lend a hand since the IT device it was once maximum having bother restoring — its crew-tracking and scheduling device — was once being serviced by means of different era suppliers, similar to IBM, as it runs on the ones suppliers’ techniques, and now not Microsoft Home windows or Azure,” Cheffo wrote in his letter.Bastian stated final week Delta needed to manually reset 40,000 servers.Microsoft calls for that Delta retain information appearing how a lot applied sciences from IBM, Amazon and others contributed to the airline’s problems from July 19 to July 24, Cheffo wrote. Spokespeople for IBM and Amazon did not in an instant supply remark.Cheffo stated Microsoft continues to be making an attempt to determine why American Airways, United Airways and others had been in a position to get better extra briefly than their rival.”Our initial overview means that Delta, not like its competition, it seems that has now not modernized its IT infrastructure, both for the good thing about its shoppers or for its pilots and flight attendants,” Cheffo wrote.Delta did not in an instant reply to a request for remark.Bastian instructed CNBC final week, “If you’ll be having get right of entry to, precedence get right of entry to, to the Delta ecosystem when it comes to era, you have to take a look at these things. You’ll be able to’t come right into a undertaking crucial 24/7 operation and let us know we have now a worm. It does not paintings.”Learn extra CNBC airline information