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By Product
Preactor is not a single solution.  It is a family of products that uses the same core code to provide solutions for small, medium and large companies. 

They have different price points and different levels of functionality. 
Users can upgrade from one product to another.  If they are on current maintenance then the upgrade price is the difference in price point between each product.

Use the links on the left, or below to search for case studies by product.