Is there anything worse than a major service outage? As we saw this week when Skype went down for 15 hours, the sudden unavailability of a tool, platform or service is a real shock to the system.
Sadly Skype's disappearing trick is not the first of its kind, with numerous high-profile companies also suffering from outages over the year. Indeed, with almost everything hosted online and in the cloud these days, the impact of an outage can be huge.
V3 has rounded up a few of the worst, just as a reminder that you cannot take anything for granted, particularly on the web.
10. Fujitsu data centre goes down
Fujitsu suffered an outage in its infrastructure-as-a-service (IaaS) cloud this summer.
The company attributed the outage to a power failure experienced by the energy company which provides electricity to its Sunnyvale data centre.
Fujitsu's TPS5 public cloud, private hosted cloud and other infrastructure services were all impacted.
While Fujitsu tried to lessen the impact the outage had on its customers, at least one customer reported the disruption to their cloud service lasted five days.
While mains power outages to data centres are not uncommon, many of the latest buildings contain multiple layers of redundancy backup power.
These range from uninterruptible power supplies that are able to handle a few minutes of power to a data centre at full capacity, to traditional diesel-fuelled generators capable of producing electricity to supply a data centre for 48 hours or longer.
It is possible that the extent of the power outage in the Sunnyvale area meant Fujitsu consumed all its backup power before the mains supply could be adequately restored though.
Found by calculating the strength of the material deep inside the crust of neutron stars
Can highlight in real-time the relevant regions of an image being described
Double legal trouble for Musk as he also faces civil lawsuit over renewed British pot-holer 'paedo' claims
Battery development could help boost performance of smartphones