A routine Windows Update triggered a series of events that caused a two-day outage of the Skype service.
In a nutshell the Windows Update went out to millions of computers at about the same time, those computers rebooted about the same time and then tried to auto log-in to Skype upon reboot at about the same time. Unfortunately Skype engineers had "tuned" their "self-healing" network for a different series of events.
Ouch.
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