Microsoft: Satya Nadella emailed Delta CEO Ed Bastian during IT outage, Bastian never replied FortuneMicrosoft fires back at Delta after massive outage, says airline declined ‘repeated’ offers for help CNBCMicrosoft says Delta ignored Satya Nadella’s offer of CrowdStrike help The VergeMicrosoft Says Delta’s Technology Outdated, Likely Contributed to Slow Recovery The Wall Street JournalMicrosoft Says Delta Was Largely Responsible for Flight Cancellations Amid Tech Outage The New York Times