Microsoft fires back at Delta after massive outage, says airline declined ‘repeated’ offers for help CNBCMicrosoft: Satya Nadella emailed Delta CEO Ed Bastian during IT outage, Bastian never replied FortuneMicrosoft Says Delta’s Technology Outdated, Likely Contributed to Slow Recovery The Wall Street JournalMicrosoft lashes out at Delta: Your ancient tech caused the service meltdown Yahoo FinanceMicrosoft Says Delta Was Largely Responsible for Flight Cancellations Amid Tech Outage The New York Times