Gartner is reporting that SaaS revenue will reach $12.1 billion in 2011. 63.6 percent of all worldwide SaaS usage [in 2011] is expected to be in North America. It was interesting to see that the issue related to SaaS varies by region  EMEA - Limited flexibility of customization. North America / Asia - Limited integration with existing systems.  "In North America, ease and speed of deployment are primary reasons for SaaS adoption, followed by lower TCO," Ms.

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