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New applications, including services, processes, and data, are almost always a much better fit for cloud computing than are legacy applications. There are a few core reasons that new applications are a better fit.
First, legacy applications (including services, processes, and data) typically have to go through a partial or total rewrite in order to successfully exist on cloud computing platforms. While many existing systems are in need of a rewrite, the reality is that having to redesign, rewrite, and redeploy services, data, and processes for cloud-based platforms substantially increases the risk and the cost. A move to the clouds therefore needs to be carefully cost justified.