Microsoft 365 outage leads to chlorine gas poisoning of 15 hotel guests

A Microsoft 365 outage on Friday prevented Phantasialand hotel in Germany from receiving automated alerts about excessive chlorine levels in its pool, resulting in 15 guests experiencing respiratory irritation. The automatic chlorine dosing system malfunctioned and pumped too much chlorine into the water; four guests were hospitalized, with one remaining for observation due to moderate injury. The pool was temporarily closed and the water was replaced after emergency responders identified the equipment malfunction.