How did one Microsoft fault stop email worldwide for nearly a day?

Teams, Exchange, Outlook and Copilot went down worldwide. Microsoft blames a problem during an earlier network capacity update that surfaced after a recent network change, and has repeatedly ruled out a cyberattack. Infoblox data showed Exchange mail traffic fell to 15 percent of expected volume.

In Naples, two-factor login codes sent by email could not reach city staff because Microsoft's mail servers were blocked. Municipal IT set up another channel for the codes, and citizen services were largely back by late morning.

Pierluigi Paganini, a cybersecurity expert, put the lesson plainly. What worries me most is what is emerging about global technological dependence on a small number of large providers.