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Excellent, I am glad that I found this. Certainly there is going to be some pain in moving up the slope, but there is gain to be had too. The trick is to get more gain for the pain, and the way to do that is reduce the pain while preserving or enhancing the gain. Some ways to reduce the pain in moving to SaaS is to migrate your code with minimal changes. If you stay with single tenant software then you have the added pain of virtualization and if you have thousands of tenants the cost and headaches of thousands of instances. If you convert to Multi-Tenancy, your choices are to modify your code to incorporate tenant isolation, or you must convert to one of the Multi-Tenant PaaS like Force.com, or you can use a middleware approach like http://www.corenttech.com does with minimal code changes and maximum standardization.

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