Creating Editable forms via Acrobat 6 or 7...

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My father ran away from creating PDF forms awhile back for one of his clients however, it's come back. They basically want all their forms turned into PDF's so the client can fill out the form (via Acrobat) and e-mail it back. However, it's my understanding that "if" he created a form and then sets it up via Acrobat Pro that the client's client would need acrobat pro in order to fill out the form, and e-mail it back.

Am I correct on this? Because I am very capable of setting up the form for him (if he needs help). However, I'm 95% sure that his client doesn't grasp what they want.

Am I wrong?

Also, if it's doable... Will Acrobat Pro 6 do the job? or does he need Acrobat Pro 7?

Thanks for everyone's help.

Bill