Microsoft hits back at Delta after the airline said last month’s tech outage cost it $500 million The Associated PressMicrosoft fires back at Delta after massive outage, says airline declined ‘repeated’ offers for help CNBCMicrosoft Says Delta’s Technology Outdated, Likely Contributed to Slow Recovery The Wall Street JournalMicrosoft Says Delta Was Largely Responsible for Flight Cancellations Amid Tech Outage The New York TimesMicrosoft lashes out at Delta: Your ancient tech caused the service meltdown Yahoo Finance