The 10 Biggest Cloud Outages Of 2011

6. Lightning Fries Microsoft BPOS

An August lightning strike in Dublin took down Microsoft Business Productivity Online Suite (BPOS) for several hours. According to Microsoft, the four hours of downtime were the result of "a widespread power outage in Dublin" that "caused connectivity issues." In response to the outage, Microsoft offered its cloud services customers a credit for the downtime they suffered.

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