I'll presume that this is either an existing VFP 9 app that they want modifications to or an existing FoxPro app they want to upgrade to VFP 9. The business case is all about the money, of course, and I think Whil outlined that pretty well. It's usually significantly cheaper to keep an app in VFP until absolutely necessary to move to something else. One look at the costs to rewrite and many business will opt to save the money. A "large corporate client" is more likely to move than a smaller business, but there may be a good reason while the Fox app is still there. If they do want to move, and you are familiar with the app, it could be an opportunity to learn something new and be involved in the rewrite.

>Hi All,
>
>A large Corporate Client of mine was prepared to update a VFP 9 App until they went on Microsoft's VFP Main page: http://msdn.microsoft.com/en-us/vfoxpro/bb190225.aspx and got scared by the statement:
>
>"Note that Visual FoxPro 9.0 is the last version and was published in 2007. For a great solution for building modern business applications, take a look at LightSwitch in Visual Studio 2012"
>
>which they interpreted this as "Microsoft is telling us to use another product."
>
>So we have another case of FUD - Fear, Uncertainy Doubt..So I have to reassure them..
>
>Any articles around to make the business case for VFP?
>
>BTW, Already own the wonderful Henztenwerke Book: The Business Case for Moving (Some) Business Applications to VFP in 2013 - Highly Recommended