Take a look at 'What's New in Visual FoxPro' at http://msdn.microsoft.com/library/?url=/library/en-us/fox7help/html/newWhats_New_in_Visual_FoxPro60.asp?frame=true and http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fox7help/html/foconbehaviorchangessincevisualfoxpro60.asp.

>I am working on an existing project which is developed in 6.0 what problems will i have with the existing code to directly use on 7.0
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>In my existing application we have lot of .vcx components will i be able to use them directly from 6.0 to 7.0 or need any modifications to those objects.
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>Do i need to make any changes to the existing code to work on 7.0 version of foxpro.