Software-as-a-service (SaaS) is like that stylish car you notice once, and then start seeing it everywhere. With SaaS, the appeal is not having to buy the "car," but paying only to drive it. SaaS also has unlimited passenger capacity. The fundamental concept isn't new. SaaS is based on the original time-share model created when computers first went commercial in the 1950s. That model was retooled as the hosted application service provider (ASP) strategy of the 1990s, which never gained the anticipated traction. And while SaaS won't revolutionize software delivery anytime soon, it definitely has its "wheels."
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