>Is there a document published, that has some kind of official look, that promotes the advantages of creating an application in VFP which can be given to potential customers when submitting on the job?
>
>Thanks

No there are not.
Microsoft promote .Net and SQLServer, that's why you will not find almost anything.
But ther are a few third party articles, which compare FoxPro with other tools or DB. I send you link to one of them.
"Choose the right Microsoft database for development needs" By Mike
Gunderloy - http://techrepublic.com.com/5100-6329-5056993.html