As Villu Arak reports 4 days after the “impact” on Skype network the network downtime was triggered from a loss of network resources, i.e. users around the globe not using Skype. And this, again, was caused by to many Windows machines rebooting after MS automated update and hence a flood of log-in requests to Skype servers. So it really was Microsofts’ fault 😉
Now it’s your turn to think about it in terms of global users’ power vs. dependency…