1. Amazon, Again And Again
Amazon suffered from two outages in 2012, and one in 2011.
On June 14, a service disruption in Amazon's Virginia data centers stopped operations for about six hours, affecting scores of customers. On April 21, 2011, Amazon cloud services went down for several hours, and in some cases days, in its same North Virginia data center.
On Oct. 22, Amazon Web Services went down in its Northern Virginia market, causing website outages in an unknown number of companies. The latest outage seemed to show that if the leading public cloud infrastructure provider was vulnerable to repeated outages, what provider could guarantee continuous uptime?