The assertion, in a letter from a lawyer for the tech giant, is a response to Delta’s claims that exposure to Microsoft and CrowdStrike was at the root of its problems from a July IT outage.

The letter is the latest in a contentious back-and-forth between Delta, CrowdStrike and Microsoft.

Microsoft says that Delta Air Lines' ancient IT infrastructure is to blame for the airline's inability to quickly recover from last month's CrowdStrike debacle.

Microsoft criticized Delta Air Lines on Tuesday for overstating the technology company’s role in a costly disruption that led the airline to cancel thousands of flights last month. In a letter ...

Microsoft says Delta ignored Satya Nadella’s offer of CrowdStrike help Microsoft suggests that Delta Air Lines’ issues were related to its old IT infrastructure — not Windows.

Microsoft has accused Delta of ignoring offers to help with recovery from the massive Windows outage last month in part because its IT systems were allegedly outdated.

Microsoft on Tuesday joined CrowdStrike in pointing a finger back at Delta Air Lines for its operational meltdown last month following a global technology outage, with a lawyer accusing Delta of ...

The accusations continue to fly in the wake of last month’s global IT outage that impacted scores of flights. On the heels of Delta Air Lines saying it has “no choice” but to pursue damages from ...

The software company said in a letter that Delta Air Lines had falsely blamed Microsoft for its decision to cancel thousands of flights after a tech outage.