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>The likely scalebility issues you have arise from a tight integration between the UI and the business rules. Just a guess. Also, if they want to go to a web-based UI to expand reach and flexibility, likely, your Fox solution will not provide a lot of help.
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We are having that exact issue right now in doing the preliminary designs to move to a web-based front end and likely a SQL Server engine. Seperating the business rules from UI is going to be the most difficult - or at least the most costly - part of the transition.